Now offering a lock-kit to use with NOS 1971 and later Skylark center caps. These will work with NOS caps that were assembled with screws and the "riveted" style. The non-screw or "riveted" versions were actually a mistake made by the vendor and never really fit the wheel right. If you grind off the rivets, you should find 4 bosses that you can tap for a threaded screw. These straps are easy to retrofit your NOS Skylark bezels so they won't get lost to the "5-finger discount" when you're at a cruise night and walk away from your car. Price is $35 for a set of 4 lock kits with all attaching hardware. Postage included. Thanks, Mitch www.buickcenters.com
These are pictures of the 70 center caps 71 and 72 should be similar I think it's just the bars and the self Tapping screws that screw into the ring. I would go to his website there's pictures there.
Here's a picture of the back showing the straps. It is similar to the 1965–70 GS that I developed years ago.
Matt, The inner bar attached to the chrome bezel is stainless. The other in the photo is nickel plated but I can furnish a stainless for both.