I'll keep above comments in mind
Mainly I got the 2 tires for a smoking deal..........FREE, and I really needed to balance all 4 and rear tires where comletely gone. I feel I acted a little bid too fast, but oh well. I didn't phisically mesured the tires but used an online calculator which indicates that there is less then .01% difference between tires, same as if your fronts were a little more worn than backs (using the same tires).
Mainly I just wanted to hear an opinion of someone who did put a different (different diameter) tires on AWD by mistake or whatever and had problems with drive train, that's all
ART