thats a good question.
I know that the rod seal (what I really meant by diaphragm...whoops) is the same part for all 92-00 civics and 94-01 integras...and its under $3
Part 4 or 23
Are the brakes locking up when the pedal sticks? Thats really what Im basing all my guesses on...if theyre not then I have no ideas other than a booster thats on its last legs
(oh and the grommet I have is part 5 on the pic)