A good used Classic Jaguar gearbox cluster gear rear thrust washer C1861 (item 36 in the illustration)

Might be of use if you're rebuilding a box and missing one or just as a spare.

These fit both the earlier Moss box cluster gears and also the later all synchro gearbox cluster gears.

At the time of listing you can get aftermarket reproduction ones for about £23 + Vat from Norman motors but its not quite the same as the original Jaguar specification item.