Common Interchangeability questions:

*When doing a rear disc conversion on an EK, you ONLY need the spindle, NOT the whole trailing arm. The spindle is held on by four T50 torx bolts and one 24mm bolt on all EF, EG, EK, DA, and DC chassis. Yes, the Torx bolts are hard to get out, and torque hard.
*88-00 Civic and 90-01 Integra Trailing arms are all interchangeable; all but the center bushing is the same.
*On an EK, use your stock LCAs, UCAs, and compensator arms or you will affect suspension geometry.
*Not all calipers may be 100% identical, but calipers and mounting brackets are Interchangeable between calipers on the following models: 88-91 CRX Si, 90-91 Civic Sedan EX, 99-00 Si, 94-95 Si with ABS, 96-97 Civic del Sol VTEC, 90-93 Integra,94-01 Integra (all models exc. Type-R)
*Civic drum rear brakes are lighter than Integra disc brakes by 7lbs spindle verse spindle.
*Civic Rear Discs are lighter than Integra Rear Discs (as a complete spindle, the rotors are identical), I don't know by how much.
*As of now, I know of no way to swap front calipers to use on the back. The caliper mount points are much farther apart for front caliper brackets, and most Hondas take solid rear discs, which are solid opposed to ventilated rotors, and they are much thinner. Also, you would have no e-brake mechanism because front calipers don’t have integrated e-brake parts.