I have come across German company called Arden, who are advertising they can supply you one for just £5147 (February 2026), with the option of having a leather lining rather than fabric (add €850).
You can also have your Hard Top painted, for an additional €950
Arden can also supply you with front bumpers, exhausts, styling kits and lights for your XJS.
Arden.de website
Their advert states :
Arden Hardtop for Jaguar XJS Cabriolet – Perfect protection and style for every season
Ensure an exceptional driving experience all year round with the Arden hardtop made of high-strength plastic carbon for your XJS Cabriolet. Designed to protect your convertible top from the challenges of autumn and winter, it not only offers reliable protection but also an elegant, st
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