Up for sale is a pair of New Old Stock Front 1996 Corvette Grand Sport Brake Calipers. I bought them without the packages but the calipers show no signs of use. The raised "CORVETTE" logos are super shiny and in perfect condition, but they do have some defects in the powder coated surface and were dusty from sitting on a shelf. 
They came on the Grand Sport one year only model but is a straight swap on 1988-1996 Corvettes that have the Heavy duty J55 Caliper option that came with the 13 inch rotors.
Originally manufactured by PBR, these were sold under the AC Delco brand as part numbers #12528689 & #12528690.
They came with rebuild instructions from PBR which I'm including and also including 2 seal kits in case the seals ever need refreshing.
Be sure to check the pictures for condition.
If you have Grand Sport or Big Brake Caliper cores to exchange, let me know since I'd be interested in purchasing them.