Hey Dennis;
Thank you so much for the advice/help.
I see on another post to Brendan W you stated-
Brendan,
If your rims are actually 15x7 with a measured 4.25" backspace, they should work beautifully with 255/60s both front and rear. Having a measured 4.25" backspace on a 7" wide rim gives and offset of +6 mm (versus a -6 mm offset with the same backspace on an 8" wide rim). That means your wheel/tire combo will be moved .5" further inboard (compared to an 8" rim) which increases your rear wheel well lip clearance.
Would the 4.25" BS be better than the 4.5" and eliminate the need for the 1" coil spacer?