I went through the same thing trying to find one. I did find one from someone on the list here, just the carrier without hardware. I was able to locate some of the hardware from LMC I think, but I don't see it in their catalog anymore. I tried to install it without much luck, it seemed to short or something. I gave up on it, but maybe I'll look at it again in the near future. You could post a parts wanted ad on this site for one and probaly find one. I'm not sure if it's worth the hassle either unless you want a completely original truck. You can mount one in the bed or like someone else said go to a junk yard and look around for one from a later model Chevy.
Joe