I don't think any of mine have had the spacer !
There is a cork gasket between the filter & the middle section, looks like yours has broken away and a small section is stuck on the filter.
Don't think that you'll easily replace this, maybe silicon the broken bit back into place.
I've managed to remove the top of all of mine but some put up a bit of a fight. As John mentioned, the nut is the only thing holding it in place but it tends to stick onto the middle section.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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