The Willans Supersport 4×4 Westfield (part number SPT422W) is a 4-point ECE R16 harness routed and fitted for the Westfield Seven chassis. Like all Supersport harnesses it carries road approval but not FIA homologation: it covers track days, road driving and events where FIA certification is not a requirement.
The Westfield version uses clip-in and wrap-around installation and fits Westfield’s own harness mounting geometry. At £84.61, it is slightly cheaper than the standard SPT422 (£98.50), which reflects the way Westfield chassis routing works without the same hardware as a full saloon install. It uses the same 45mm webbing and clip buckle as the rest of the Supersport range.
The 4-point layout adds a sub strap under the seat compared to the 3-point WILSPT322W, which helps keep the pelvis in place under braking. If your Westfield is entered in events where FIA approval is required, the Club harnesses CB432W and CB433W carry the correct homologation. Six colour options.
Lead time is 1 to 2 working days. If you need help choosing between variants, drop us an email or click to open a chat and we’ll confirm the right spec.
SPT422W.










