I got the numbers from a guy on Honda-Tech.com Here they are and it will work accoridng to him, I'll be buying a new clutch tomorrow:

88, 89, 90+ are all different.
88 needs 88.

89 can use 90+

Talkin if flywheel/tranny the same year.

Spline = tranny input shaft

88 19 spline, 200mm clutch disc
89 20 spline, 200mm clutch disc
90+ 20 spline, 212mm clutch disc

now.. some numbers im almost 100% sure are not accurate but u can get the idea of which clutch works on what tranny/flywheel combo.

a 90 clutch will fit the 89 tranny but it will overlap the flywheel, but still works just fine.