You're right, I did find that same part number on other cars, Torinos I think, and others. And while it would be fun to hunt down these old timers in junk yards, like I did in the "old days", I'm not that young anymore, and there aren't that many 60s-70s cars left in the junk yards around here (south of San Diego, near the border with TJ). So I will get by using M22 star washers glued to large diameter fender washers, pretty sure they'll do the trick.
