I have seen a couple of XJS’s fitted with the 18″Aston Martin DB7 Turbine alloy wheels and Pirelli P Zero tyres.
As the DB7 is practically a mk2 version of XJS I gather these fit. Not my taste but there is currently a convertible on eBay with these fitted so you can see wheel fit.
I’d put a link to listing but not sure how – so check out Alpine green 1988 convertible – ‘reduced’ to £15,500 on eBay – 5days until ends.
Aston wheels are often available as owners update the early DB7 wheels for later versions – cost even more than Jag ones when new..

Robin