SBP disc brakes
Might be an "apples & oranges" situation here, but I tried a 14" X
4 1/2" sbp STEEL wheel on my SSBC equipped front disc brake '71 Dart GT. It didn't fit. So, I contacted SSBC and they assured me the 14" X
5 1/2" STEEL wheel would fit. It didn't.
Oddly enough, the factory 14" X 5 1/2" RALLYE wheel fits perfectly (picture).
I would suggest borrowing a 14" X 5 1/2" STEEL wheel to test it. My .02 cents!