Upgrading Rims and Wheels for a 1968 Dart GTS

Thank you all for your input this is a great help. The Small Bolt Pattern is always a challenge, but I was considering 15" x 6 in the front as suggested, and then 15" x 7 in the rear with the wider tread in the rear for a little better traction. Thoughts???
GTS Joe
Vintage wheel available at summit racing. Real reasonable prices. They have 15" rims in the sbp. 5" to 8 and 10" wide. Don't go to 17's or 18's on such a nice car. You won't like the ride ,,,Imo.