I have seen these valve cover hold downs (halos) on several occasions. They were an aftermarket item sold to help seal a distorted valve cover. Not really rare, but used and discarded when customer decided to replace the valve cover with a new one. I was looking for one a few months back. If you are interested in selling it at a reasonable price just PM me. Also interested in that under bed spare tire carrier. Let me know.

Thanks,

Tim

Last edited by fixit1958; 08/20/2015 2:48 PM.
"Pay attention to the details! It ALWAYS pays off."

1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle