We did a forum on this not long ago, think it was either in hot rod talk or shop talk. Anyway, you can use a GM Metric caliper (like on a 79 Monte Carlo), a front rotor off a Jeep Cherokee (if your bolt pattern is still 5 on 4 1/2, then fab or buy the bracket to mount the caliper to the housing. Many of these kits for sale, or do your own at the parts store. Try Speedway Motors for the bracket or your local circle burner parts store.