Create your ideal windows below, or contact the team if you have a specific requirement.

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Customise your windows:

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

Regular price $357.00 USD
Regular price Sale price $357.00 USD
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US orders ship in 3 weeks (5 for hard-coated). Delivery in 3–17 business days, depending on location.

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Product information

Every Race Plastics window is custom-made by our experienced team in the UK. Built for motorsport, these polycarbonate windows are lightweight, shatterproof, and far stronger than glass. Unlike acrylics or Perspex, they won’t crack under pressure—giving you peace of mind when you’re pushing hard.

Our standard spec uses 4mm thick polycarbonate, meeting key racing regulations. If you need more strength, we also offer 5mm FIA-compliant windows and hard-coated options for extra durability and scratch resistance.

Windows come in clear, bronze, or grey tints, so you can match the look to your build. You can also add sliders to either or both front doors, depending on how you want to manage airflow.

Window Sliders

Our slider kits are built from the same high-quality polycarbonate as your main windows. Designed for both driver and passenger sides, they’re smooth, secure, and built to last.

You can choose between:

  • Smooth operation with three fixed positions, no rattle
  • Simple and reliable, with two preset stops

Easy to fit and made to avoid rubbing or scratches, these sliders are ideal whether you need more air on track or better control on the road. For full specs, visit the Window Slider Kits page.

How long does shipping take?

We’ll confirm your order right away. Standard polycarbonate kits are usually built and shipped within 3 weeks. Custom or hard-coated orders may take longer—we’ll reach out to confirm the lead time. If you’ve got a race coming up, let us know and we’ll do what we can to hit your timeline.

Can I install the windows myself?

Yes. Most builds are straightforward and there are plenty of how-to videos online. Unless stated otherwise, our windows are made to fit into standard rubber seals. Need bolt-in versions? Just reach out.

Can I pick up my order?

We usually ship via courier, but yes—collection from our Leeds facility can be arranged. Just drop us a message.

Need to change your order?

Get in touch as soon as you can. We’ll do our best to make changes, but if production’s already started, there may be a cost to amend the order.

  • 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.

  • Road legal warning

    Always check your local vehicle regulations before fitting.

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 mk1/Cosworth 3-door rally car

The Ford Sierra Mk1, introduced in the early 1980s, revolutionized the rally scene with its aerodynamic design and advanced engineering. Unlike its predecessors, the Sierra Mk1 featured a sleek, modern look with its distinctive sloping rear end, which significantly reduced drag and improved high-speed stability. The car's rear-wheel-drive layout and innovative independent rear suspension provided excellent handling and balance, crucial for the demanding twists and turns of rally stages. The Sierra Mk1 was initially equipped with a range of engines, but it was the high-performance versions like the RS Cosworth that truly shone in rallying. With a turbocharged 2.0-liter engine, the Sierra RS Cosworth delivered up to 224 horsepower, allowing it to compete fiercely against the top rally cars of its era.

In the rallying world, the Ford Sierra Mk1 made a significant impact, particularly in the Group A category. Its competitive debut was marked by its participation in various European and World Rally Championship (WRC) events. The Sierra RS Cosworth's reliability and robust performance made it a favourite among both factory teams and privateers. The car's success was highlighted by its notable victories and consistent top finishes in major rallies, showcasing Ford's engineering prowess and commitment to motorsport excellence. Drivers appreciated the Sierra Mk1 for its power, handling precision, and the sheer thrill of driving it on the edge. Today, the Ford Sierra Mk1 remains an iconic figure in rally history, remembered for its role in elevating the standards of rally car design and performance.

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.

View Sliders

Need Glue for your New Windows?

  • Why Polycarbonate Windows?

    Learn about what polycarbonate windows are, what benefits they offer and why you should use them.

    Find out why 
  • Perspex or Polycarbonate Windows?

    Find out which you should use for your race windows, why, and which one will protect you the most whilst racing.

    Find out which one 
  • Our Frequently Asked Questions

    Get the answers to key questions on products and services, including deliveries, collections and timescales.

    Find out more 

Need help with Ford Sierra mk1/Cosworth 3-door windows?

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