Help!! AP racing caliper broken!!

[bhpjon]

At the beginning of the winter, i bought a set of four pot AP racing calipers off ebay (from a Cerbera) complete with hubs etc, after spending most of the dark days sandblasting ,spraying and getting adapters made, i fit them to the car the chim the other night. One of the brake nipples was stiff so i heated it ,oiled it,heatede it again, but it still shattered the casing around the nipple when it finally budged!!! So basically i am looking for another ap racing 4 pot 5200 (103 w) to canibalise to make mine good (as i can split them in half if i can find another scrapper) or purchase a good single caliper as a going concern, then i can get the beast out in the sunlight once again!! Any help gratefully recieved!!