[weim55]

The rally wheels you show in your picture look to be the same as 68-79 vette 15x8. These have the most negative ( toward the outside )offset of any factory rally wheel. Factory 70-75 15 x 7 monte Carlo rally wheels would fit your current tires just fine and give you 2-3 inches toward the inside easy. These wheels are not rare at all, likely to be on craigslist most of the time.

Steve weim55 Colorado