[c_rock]

The calipers for a Cadillac have an e-brake and they are supposed to work perfectly. I think you need the ones off a 78 El Dorado.

 

[c_rock]

DIY4X makes a bracket kit for $65, click the link. You could probably make up a bracket like it yourself.

14 Bolt Full Floating Disc conversion Kit

 

[c_rock]

I used some grade 8 bolts for my springs. I just ground down the head so it would fit in the hole. 3/8" diameter are what you need.