I need to know what spindles and disc brakes that I can use to convert my 55 chevy bel air from drum to disc? thanks for the help.

You use your spindles (55-57 are the same). Our car (57 Belair 2dr Sedan) uses the rotors from Chevelle(Malibu) from 71-72, I believe. I don't know which calipers are mounted to the brackets as they were there when we got the car. The master cylinder is from a 60's Corvette which had no power, disc front, drum rear, available at your local parts store. The proportioning valve assembly is from a Chevy pickup of the 70s or 80's, it mounts on a bracket right beside and below the master cylinder. The bracket sandwiches between the cylinder and firewall, a stock Chevy piece.