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Regular price £215.00 GBP
Regular price Sale price £215.00 GBP
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Note: Unless stated, all windows are sized to fit into rubber seals. If you need bolt-in sizing, then please contact us.

Orders are dispatched within 3 weeks, for hard-coated allow 5 weeks.

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Product information

Our polycarbonate windows are hand crafted to order by our experienced UK based team. They are designed to be safe, strong and lightweight, making them ideal for motorsport. They are much stronger than glass and shatterproof, unlike Perspex and other acrylics, so you are well protected whilst driving.

Our standard windows are manufactured from 4mm thick polycarbonate to comply with Motorsport UK regulations, whilst we also offer 5mm FIA compliant and hard-coated options for those looking tougher windows.

All of our windows are available in a choice of clear, bronze or grey polycarbonate so can choose the windows that best suit your car. You also have the option to add window sliders to either one or both of the front door windows depending on your preference.

Window sliders

Upgrade your vehicle with the Race Plastics Window Slider Kit, designed for both driver and navigator sides. Crafted from the same high-quality polycarbonate as your chosen window, these sliders ensure seamless integration and durability. Choose between two locking systems: the Click-Click Bearing Lock for smooth, rattle-free operation with three adjustable positions, or the Split-Pin Lock for a simple, secure, and reliable solution with two preset positions.

Engineered for flawless fitment and effortless installation, our sliders prevent rubbing and scratching, keeping your windows looking sharp. Whether you need maximum airflow on the track or controlled ventilation on the road, this upgrade delivers race-ready performance. For more details, check out our Window Slider Kits.

How long does an order take to ship?

We will confirm receipt of your order straight away and will be in touch if we have any questions regarding your order. Standard polycarbonate orders are usually manufactured and despatched within 3 weeks of the order being placed. Specialist orders - for example if you choose hard-coating plastic - will take longer, but we will contact you and discuss this with you. If you need your order by a certain date then please let us know.

Can I fit the window myself?

Yes, it is straight forward to remove an existing window and install a RacePlastics polycarbonate window. There are plenty of guides on YouTube to help you do this. Unless otherwise stated, all windows are designed to be fitted into rubber seals, please contact us if you require bolt in versions.

Can I collect the order myself?

Yes, we usually courier orders out to our customers, but if you contact us, we can arrange for collection from our Leeds factory.

How can I change my order?

If you need to discuss or change your order in any way, please get in touch with the team at the earliest chance. We will always try to accommodate any changes but costs may be incurred if the manufacturing process has already started.

  • Expertly crafted in the UK

    All of our windows and sliders are hand made to order by our team in the UK.

  • Motorsport compliant

    Our standard windows are made from UK compliant 4mm Polycarbonate.

  • FIA & hard-coated options

    We also offer FIA compliant 5mm & hard-coated options.

  • UK road legal warning

    All but bronze & grey tinted front door windows are legal on UK roads.

Not found what you need?

Need a single window, or have a special requirement, no problem. Just let us know what you need.

The Ford Sierra Sapphire 4-door rally car

At first glance, the Ford Sierra Sapphire looked like just another family saloon, a practical four-door version of Ford’s well-established Sierra hatchback. But beneath its sensible, business-like exterior lay the DNA of a true performance legend. Introduced in 1987, the Sierra Sapphire retained the key elements of the original Sierra while refining its aerodynamics, handling, and, in certain versions, unleashing some of the most exhilarating performance ever found in a four-door saloon.
The Sierra had already made a name for itself in motorsport, with the three-door Sierra RS Cosworth tearing up touring car championships and proving itself as a rally weapon. However, Ford knew that not everyone wanted a big-winged, three-door homologation special, some people wanted power with a touch of subtlety. Enter the Sierra Sapphire RS Cosworth, a four-door version of the Cossie that brought all the speed and aggression of the original but wrapped it in a more understated, everyday-friendly package.
Under the bonnet was the same 2.0L turbocharged Cosworth YBB engine, producing 204 horsepower in early models, with power jumping to 220 horsepower in the later 4x4 version. In a car weighing around 1,250 kg, that meant serious performance. The rear-wheel-drive models were tail-happy monsters, with plenty of power sent to the back wheels, making them an absolute joy for skilled drivers, or a terrifying handful for the unprepared. The later Sierra Sapphire RS Cosworth 4x4, introduced in 1990, added a permanent all-wheel-drive system, improving grip and making it even more of a threat on wet or loose surfaces.
The Sapphire Cosworth wasn’t just a road-going rocket, it was a motorsport powerhouse. Ford built a Group A racing version, which saw action in touring car championships and rallying. In the hands of teams like Texaco Eggenberger and Andy Rouse Racing, the Sierra Sapphire dominated circuits across Europe, Australia, and beyond, battling the likes of BMW M3s and Nissan Skylines in some of the most legendary tin-top races of the late 80s and early 90s.
In rallying, the Sierra RS Cosworth 4x4 became an essential stepping stone for Ford’s transition into the Escort Cosworth era. While it didn’t reach the dominance of some AWD rally cars of the time, its balance, turbocharged power, and rugged drivability made it a popular choice in national and privateer rally teams, proving its capability on gravel, tarmac, and snow.
Even beyond the RS Cosworth models, the standard Sierra Sapphire was a brilliant car in its own right. It was comfortable, practical, and well-built, offering a smooth ride and decent performance in its more common 1.8L and 2.0L variants. Whether being used as a company car, family hauler, or weekend racer, it became one of the most popular saloons of its era, earning its place on Britain’s roads in huge numbers.
Today, the Sierra Sapphire, especially the RS Cosworth versions, is an absolute legend. It’s become a sought-after classic, with values skyrocketing as enthusiasts and collectors hunt for original, unmolested examples. The combination of four-door practicality, rear-wheel-drive madness, and turbocharged power makes it one of the most exciting performance saloons ever built, a car that could blend into traffic one minute and leave sports cars in its dust the next.
For those who drove one, the Sapphire Cosworth wasn’t just a car, it was an event. The turbo lag, the boost surge, the feeling of an old-school Ford trying to shake itself loose at the rear, it was a thrill every time you got behind the wheel. Whether in racing livery, rally trim, or a well-kept street sleeper, the Sierra Sapphire remains one of Ford’s greatest achievements, a reminder of a time when family cars could also be absolute monsters.

Thought about a slider kit?

Our easy retro fit window slider kits are the essential addition to your racing windows with standard and advanced kits available.

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