What size tires will fit on stock dart 15" wheels?

I'm running 15x6 on the front with 205/65/15s and 15x8 0n the back with MT Sportsman S/R LT 26x10R15 on the back.Can't remember B/S what ever the standard is for 15x8 sbp.Picked them up at Summit not a special order.No rubbing issues,but it is pretty close on drivers side as my rear end isn't centered real well. The wheels Wheel Vintiqes steelies.If your using them and running dog dishes you'll have to grind the nubs that hold the cap.Not stamped deep enough and the caps pop off real easy.Unless they've changed their dies.

Backspacing is everything, and there is no "standard".

A quick look at Summit shows that they have the Wheel Vintiques steelies in SBP and 15x8 in both 4.5" and 4" backspacing. Of the two I'd wager you have the 4.5" backspacing, which isn't ideal but might work on some cars with the SBP. Of course, they also offer the sbp rallye rims in a 4.625" backspace, which would be better, and they certainly could have offered the steelies in that backspace at some point as well.