Jack,Mich,
I figured the 215's would normally be a good all around size for the fact that they're standard on the GN, Monte SS, 442, etc. I've had 215's on my car in past years. I went with 235/60's which are just a slight bit wider and maybe a fraction taller. Although, I do get some rubbing up front lock to lock.
Btw, the wheel in the picture above looks really good on there. Is that one of the wheels off of your coupe?
Youre correct about the Weld wheel. Its off the coupe. I kinda liked the way it looked ! Tried the 8" on the rear and not even close to fitting. That was with 275/60s. It would have looked pretty tough though !
Is your wagon lowered ?