Rare J-56 dual pin special heavy duty front brake calipers for late 1967 through 1972 Corvettes. Casting number LH(inner #5469589x, outer #5452273) and RH(inner #5469588x, outer #5452273). Rebuilt by SS Brakes for Zip Products in 1994. I purchased them at 1994 BG from Zip(last set that they were going to sell). $2,000.00 plus $40.00 UPS(V/MC/Disc).