Janine,
You took the words right outa my BRAIN! I am doing the same as you on a 1965 C10 too. You are further along than I am however.
I've been researching and here is what I believe to be correct info. Using the stock wheels from a later model 4X4 Blazer or C10 will probably work. I think you will need to get them from a 1971 or newer truck that's a 4X4 (because the 4X4 was still 6 lug).
Aftermarket wheels will work too and I think Vintiques sells what you want. What size disc rotor did you choose for the front? I hope you'll share your info with me so I can do the same.
One thing to keep in mind is that the stud size (length and diameter) and threads on the new CPP kit might be different than stock, so factor that into the final plans.
**Edit** I just researched
a post I made a while back . The answers given to me then might help.