I bought a set of 14X6 Minator (mini-lite look alike) wheels and they don't rub the frame at all (77 Spit). They did connect with the fender well on the first trip out of the driveway, though...curled the fender lips a bit and no problem since.
That doesn't answer your question, though. I'll measure the backspacing tomorrow and get back to you. No promises...I'm also pulling the cam out of my LR Discovery tomorrow (not just to punish the old girl...the cam is worn quite severely).