Searching the archives I have not seen the dimensions for the oil canister seal numbered 6883, as fitted to XK150, E-Type, and the MK2.
Can anyone tell me what size they should be? I fitted the smaller of the two seals that came with my filter, and I have a significant leak. I had to stretch this seal slightly to fit in the groove, whereas the larger was too large to sit in the groove.
Roughly, the dimensions of the two seals are :-
Smaller: width 1/16", depth 1/8" (1.6mm x 3.2mm).
Larger: width 1/8", depth 5/32" (3.2mm x 4.0mm).
I did ensure that there was no old seal in the groove - it seems that there was not one fitted previously!