if the transmission is not 88 which has 21 splines on the input shaft, it will have 20 splines - use your 90 flywheel and 90-91 CRX/Civic clutch - if it has 21 splines, use 88 flywheel and 88 clutch - since the ZC transmission uses a ZC intermediate shaft and equal length 90-93 Integra axles, check your engine block to see if it has holes for mounting the intermediate shaft