Chris, do you need small spacers for clearance with the new wheels ? How much are we talking here ?? I've used the thin Mr. Gasket spacers before, around 1/4" thick, with no troubles. Ideally, wheel spacers shoud be hubcentric, but with ones it's not a huge concern. You definitely need to be careful that you still have enough thread engagement on the wheel studs, minimum is at least 1/2". Most of the off-the-shelf 5-stud wheel spacers I've ever seen have been for 5 on 4-1/2", 5 on 4-3/4", and 5 on 5" bolt pattern, so they would probably have to be "modified" with a file or a die grinder to work on the SC 5 on 4-1/4" pattern.
cheers
Ed Nicholson
SCCoO