This may be a dumb question but here goes. I have a 71 GTX that I am putting 15x7 Rallye wheels on with Goodyear Polyglas L60-15 on the rear and G60-15 on the front. My question is with the Rallye wheels. I am having a really hard time finding them and most vendors I have tried can’t really say for certain when they will have them. (I have literally called 15 places and I’m not exaggerating). I have managed to score 2 brand new 15x7’s with 4.25 backspace. I can’t find any more of these but I can find 15x7’s with 4.5 backspace on eBay. A guy has a few new ones from US Wheel. Will there be a noticeable difference if I use these two different backspace wheels? Use a spacer to make up the 1/4”? And which ones should I put on the front or back with respect to the tire size I have. Or.....just wait until I can find 2 more 4.25 backspace ones? Really wanted to have the new shoes on the GTX for car shows this year but if it’s going to look bad or just plain won’t work it will have to wait. Thank you. I always seem to get really good advice on here.