Here is a pic of the completed job using Dougs set he graciously sent me for 55 bucks. Original metal pair.
I marked the area where the old sticker was in RED. It was a white sticker, 3 inch by 4 inch, with a few paragraphs of writing in black. One, maybe two diagrams or symbols. Doug is on the road I think, but when he returns he may be able to answer this mystery.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?