Alright, did some more digging on the forums and came across this thread:
https://www.crossfireforum.org/forum...e-upgrade.html
This answered all of my questions:
1. I am correct that the washers go between the caliper and hub. Pretty self-explanatory, but wanted to make sure.
2. The above thread mentions the use of washers from Lowes. I went on Amazon and found Mr. Gasket 7/16" head bolt washers. High grade steel with corrosion resistant zinc finish. Seems like a logical choice.
3. Lastly, my SRT6 wheels should fit with this setup: CL500 calipers (cheaper than the C32/SLK32 ones and identical, from what I read and can see, Brembo and all) and SRT6 sized rotors.
Parts have been ordered and I'll check back in once everything is installed. I plan on painting the calipers black and putting silver Brembo decals on. This will then be paired with Stop Tech slotted rotors and stainless brake lines. Hopefully, all goes well!