I cannot answer that yet as my car is still in body shop, but a friend of mine (goose919) has them but he used the same size on both front a rear ( 17X8 with a 4.5 back spacing with 245/45-17 tire) and he did have rubbing on the front but that was because he had an aftermarket 2" drop springs in the front (I think they were global west or Hotchkiss) and after he put a small spacer under it he was good. Also from everything I have read and seen you can max out on a 69 with these sizes, but I don't know about the67/68. 17" wheels.... 17X8 with a 4.5 back spacing can max out at front with a 245/45-17 tire and the back wheel is a 17x9 with 5 back spacing can max out at 275/40-17. If you start lowering it in the front you might run into problems.