On my 74 Duster I have 17x8's on the front with 5.25 backspace (+19mm offset).
I also have 17x9's on the rear.
My front's have 245/45R17 tires & the rears have 275/40R17's.
But then again I have front disk brakes with a QA1 Upper control arms. Nothing rubs.
@72bluNblu is the guy to talk to about fitting 17's and 18's on these rigs.