These are custom stainless door strikers for EBodies and other CPD cars. I had these custom turned and made a few extra sets to sell. The are a unique 2 piece design but look like one piece. Integrated washer with allen head to tighten it down. As far as I know I am the only one that sells these for a the e-body. And yes, the are the correct dimensions...
They are beautiful. I have one polished set and four unpolished sets. $79.00 / set plus $5.00 shipping (anywhere in the US).
EDIT: I forgot to add "Plus Shipping".