I sold (10) to a guy in El Paso, Texas. could not sell them here. All were #895's, clean southwestern condition. Can provide his contact info, he is a full time seller.
i have a set of 4 off a 73 riv, i will take them down and look at them once, been up on that shelf a long time, email me ghildebrand@wi.rr.com Greg
Seen a few sets come up on Facebook Market Place a few days ago. Don't have a link though. It said it was for a Skylark but they were not for a Skylark, they were for a big car 5 on 5 bolt patteren
You are looking for wheels with "853" stamped inside them by the size stamp. Those are for 66-70 Riv. The chart below lists all of the stock Riviera rally wheels.
Mid seventies would be the #895, those are by far the most common. In terms of what you will find today.