A good used Laycock overdrive annulus assembly as fitted to the S Type, 420, MKX & XJ6 from the Jaguar range, it was probably fitted to other British classics fitted with Laycock compact A Type overdrives to but obviously check compatibility before committing to purchase.

Jaguar part number 10856 or I think laycock number 65897 Item 65 in the illustration.

Please note there is some surface staining and light pitting on the braking surface (see pictures) but I doubt it'll affect performance..