Alcon / Raybestos Racing brand short track 6 piston heavy duty front brake calipers.  Models: PSC4412x113L /114R.

Features 40MM / 4MM / 30MM staggered pistons. Caliper accepts up to 1 3/4" thick rotors. Monoblock, super rigid design.  Billet aluminum.  Designed for radial mount calipers.  Comes with Raybestos radial mounts! 

Matched set of calipers. Good used condition. Modern version calipers! 

See other brake calipers in my store, Used Race Parts Supply.