Well,haven't done any serious bargaining yet, just getting a feel for what's out there.
I was trying to use parts I already have on hand to save money, so have disc brakes with 4-100 bolt pattern, but the wheels are 13x5.5
Ideally I would find some 3x16 wheels with the 4-100 bolt pattern, so I might have to find a good deal on some old BMW's unless someone has a better suggestion.
Basset makes a 13x6 with a 4-100 bolt pattern. SR can probably get them for you.
There are a bunch of street cars that use that bolt pattern but most use 14 inch or bigger diameter. Chances are they will be pretty heavy if you can find the right size.