Hey guys want to pass along something you may already know but want to share.
The Horn Relay for my Chevelle was in pretty bad shape on the outward appearance but works fine. I searched to see if anyone offered a repo cover similar to what is available for the voltage regulator. I came up empty handed. Hated to buy a complete Horn Relay if all was wrong with the one I had was the cover. I found a complete Delco horn relay for a different vehicle at a great price that appeared to have the same cover. I took a chance and purchased one and it turned out to be the exact same cover. They are NOS and do show some age and corrosion but would be excellent for re-plating or leave like it is. I'm leaving mine like it is. It will work great for my application.
Here is a link to the ebay auction.
https://www.ebay.com/itm/175218986733
Here are pic of my Horn Relay.