A good used rear hub carrier spacer, as fitted to the E Types and also the S Type, MKX, 420 & XJ6/12 models, Jaguar part number C19110/F item 11 which is 0.124"
 
New aftermarket reproduction ones retail at £10 each but if you want genuine Jaguar parts they are £10.33 each so if you're after a good used spacer but don't want to pay £16.73 for a genuine Jaguar part then this might be for you.