My perfectly good clutch was failing due to the lousy felt seal on my nice rebuilt B18. So I will not make the same mistake again I want to install the neoprene one from the later engines. I understand that the housing needs to be modified. Is it possible for me just to have the housing moded to the new o.d. of the later seal (press fit I guess or does the later seal have some kind of thrust/locking ring?) Also which car does the later seal come from early '70s B20s or is it from the b21 ?. Thanks as always, Patrick.
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Disclaimer: be careful, work safely!!! If you have any doubts as to the safety of the work you are doing, consult a proffessional before you hurt yourself or others!!! I'm not a licensed mechanic, I have just been fixing stuff my whole life, patrick of

The neoprene rear seal and housing is from the B30.
I have one in the garage. However, you really want to understand what is causing the excess crankcase pressure. The felt seals (front and rear) worked well if other things (like PCV) didn't cause high pressure.
If you are racing, or other constant high rev operation (like driving in Montreal traffic), you may need the neoprene.
I am in Oshawa, Ontario if you want to try the neoprene.
waynechristie@sympatico.ca is the more direct method to communicate.
Where are you in Montreal?
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123GT 1967

Mu understanding is that the seals used in the modified B20 hoisings IPD sells are standard B21 items. The B20 housings need to have the hole machined slightly to fit, the seals press in.

Try WWW.newvolvoparts.com they sell this item for a lot less then IPD.