quote Originally posted by Xantheon: Which calipers do these use? Stock or other upgraded ones? Also, are these for '88 or '84-'87 models?

84-87 models. There are write-ups for different front calipers (Camaro/Cadillac/GM "Metric") where the bleeder ports are in different positions along with the inlet port. Rear calipers are from a 79-85 Eldorado, 79-85 Riviera, 80-85 Seville, or 79-85 Toronado in order to use the park brake (without a park brake, you could use the same as the ones on the front).
A little searching on the subject will give you a lot more info about those who have experimented with different setups front/rear.