Perfect! Many thanks for confirming exactly what I thought. When I pulled my clips off they looked exactly like yours although it was difficult to tell after 45 years. What threw me off was that all of repop suppliers only sell this clip in the red color (why, I don't know!). I must admit that what got me thinking about this was one of the photos in your build (which by the way, has provided me with a ton of useful information) showed them as phosphate. From what both you and Mike have now confirmed I feel confident in applying a phosphate finish.
BTW...I have already beaded my originals and there is no sign of any pitting and they're in really great shape. Since they are original to the car and have the anchor markings I'd like to reuse them if possible. So, in your opinion can these be phosphated and reinstalled or would you suggest buying new ones and go through the process of beading and phosphating? Also, you're idea of using a center punch to reinstall them is great. I kept scratching my head trying to figure how these got installed to begin with.
Once again, many thanks!