14" RALLY WHEELS ($40 EACH $75 FOR BOTH)

Backspace?

I believe it's 3.75" (that's what my mechanic/tire guy tells me) - I just verified this with him. Similar wheels on Summit Racing's site appear to show 4.00" as the minimum backspace (Vintiques wheels) - so would 4.00" be the standard minimum for OEM rally wheels of this type? Any guidance or input from other forum members welcomed.