Well yeah, that style of wheel was really popular in the 70's. However, there were 2 different styles of "unilug" wheels. The more popular were the ones with offset washers fitting into oval bolt holes. The ones you have weren't as popular. With the much larger stud openings in your wheels, you need to have the matching stud adapters. I tried searching a few sites without luck. You might try older tire stores that have been around since the 70's. They might recognize what you have, and with a little luck, they might still have some old stud adapters laying around. Ya never know