Power Steering/Brakes conversion help

[LSUMurse]

I got myself a 1968 Chevy C10 and I am trying to develop a rebuild/restore plan. My wife will eventually be driving this truck with me on long trips, so the manual steering and brakes are going to have to go. My question is: What other vehicles can I yank the necessary parts out of? I've been told a '72 C10's spindles will bolt right on for the brakes, but finding one with the parts still on is not the easiest thing in the world. I was hoping to broaden the horizon as far as compatibility goes, say some other types of vehicles. Any help would be much appreciated.

PS. For some reason I can't post to the sell board so, I have an original gas cap off my truck that I won't be be using (in my neck of the woods, you better lock it, or lose it). The pictures aren't the greatest. It's green and a little surface rusty. A few very small dents on the top. As you can see the gasket is cracked and missing little bits. It's free to a good home, just send me $5.35 for the USPS ship anywhere box. First come, first served.