I'm in disc brake trouble

[gator2511]

Back in 2009 I bought a rear disc brake kit from Blackbird trucks and it has worked very well. I managed to hurt one of the rotors and can't find a replacement. I was told at the time that it was a 92 4x4 Chevy rotor but that wont work without machining. My truck is a 72 4x4 shortbed. Does anyone know of a source for a rotor like this? I'll buy an OEM rotor and have it machined if I have to but buying one outright would be easier. Oh yeah, I'm using 68 Caddy calipers with the e brake. Thanks guys!