I have reproduction center caps and lug nuts for most Buick, Riviera, and Skylark rally rims from 1965 through 1978. I've been making and selling these reproductions since 1987. If you send an email to me at mitchromanowski@sbcglobal.com, I can send you a pdf which shows pictures and pricing for my center cap repros.
And they are beautiful. Mitch is a five star seller and whatever he tells you is exactly how it will be, none better. Thanks Mitch, Mike
X2 I just wish he had the silver 72 style before I paid an arm and a leg for NOS, that I cannot lock on
Sure. I have repros for a 1970 Electra. Here's my website www.buickcenters.com The 1970 Electra would probably have come from the factory with the 66-E center caps. If you are certain that your rims are original to the car, then the hole size would be 2 1/8 inch in diameter. If you're not sure, then measure all the holes. Buick factory chrome wheels had either a 2 inch or a 2 1/8 inch hole. Send me your zip code and I'll quote you a total price including USPriority and insurance. Thanks, Mitch