Not the best photo but this is my truck with 53 Merc rings when it was red.
Jeff Spence sells Merc style rings that he makes or has made. They have the right look.
http://kustomsbyspence.com/products.html
His facebook store page shows a lot more of what he offers.
https://www.facebook.com/jeffspencekustom/?__xts__[0]=68.ARBhI_7e03AvEz6myAdvYZm5YkWXgU7bD0_prHM8aZzxKKjhD_XsE9V72RykQ_8XcAI27EjQup0mtI7yC1sDFwVK1nMv-XvUekrjubQOLTEdBaSy8rx0NCCG24E_85gZmB-JKB8jvImqB6n3eoJrOLXr9YN5W665k9RBtBV5FiWeUkmww5ZZ56nXQ8hk0cinUbTXodDuKhUS9ai4YJQp9J1_x6AeMOoVQO-YMzwr-WrGOVdjeGSilgA-dtXQ7WE3ecIvYu1w93teKkISul26YT4GKCNKN-6mS40RyMIW63nXOykINNg
His 8-3/7 x 1 inch deep for 7 inch lights should just come out even with the edge of the bulb much like welding a plain healight ring on a fender.
Those rings should end up looking pretty close to the ones on Paul Harper's 41 Ford.

I can't find a photo of an AD truck with the look.
This burgundy 41 that was at the same event in 2005 had 53 Merc headlight rings to show the difference.
Purple AD panel with the Merc rings at the same event
Or what about a 55 Chevy car ring and eyebrow that you can buy as a patch panel.