well i have a 90 integra and im installing the front and rear polyurethane motor mounts but when i install them the round outside part sticks out about 1/2 in. which is not letting me install them to the brackets. ill have some pics so yall know what im talking about.

 

what exactly is the round outside part? The sleeve? if the sleeve is sticking out then you need to push it in further. It may be getting stuck on one of the inserts. If it's the actual insert, they are tight but you just havfe to play with it a bit to get it back in.