With a 15x7”, 3.75” backspace would mean that even a 205/65/15 would be marginal on the fenders. By that I mean it would have the same distance to the fenders as the 275/35/18’s on 18x9’s that I run, and I’ve rolled and pushed my fenders, lengthened the fender brace, etc. So depending on your ride height they might not be a safe bet at all.
I ran my Duster with 73+ brakes and cop rims for awhile, those were 15x7’s with 4.25” backspace and 225/60/15’s just barely cleared with the bodywork stock.
I’m curious too what tires you were running on the 17x8’s with 5” backspace. It’s not quite enough to get decent width tires up front, but it’s not terrible either.
