Actually, I'd think it would be acceptable to run the 6.5" in back and 6" in front. Toss one of those 6.5" rims on the front of your car one day and see just how close the tire rod comes to the rim. I know it's darn close on mine.

At least you're not in the position I was. My car came with four Bundts, one of which is hopelessly bent, and one of which was 6" while the others were 6.5". I now have three each two different 6.5" versions that are in acceptable condition to be refinshed, so I picked two from each pile to use for my car. Now, what am I ever going to do with this 6" Centra Bundt, I do not know.

You can fudge tire widths a bit. a 195 (195mm width) is more fitting to 6" rim, but will fit on a 6.5", so you could likely get away with four matching tires on two sets of rims.

Do you know the part numbers on the rims? I've got a good list going, and may be able to identify offsets and such for you. One of these days I'll post all about Bundts in the Wheel and Tire forum, since no good post exists detailing all of the Bundts and their differences.

__________________
- K.C.Adams

'77 300D Euro Delivery
OM617 turbo / 4-speed swap
404 Milanbraun Metallic / 134 Dattel MB-Tex

Current status:
* Undergoing body work

My '77 300D progress thread