Why are these two sway bar brackets different. The one on the left I took off a 69 COPO Camaro. The one on the right I had on the shelf, I assume taken off a Camaro from a previous restoration. I don't think it's a repop but I may be wrong. The one I took off the COPO has a little more rust damage than I like to see so I was considering using the one I had on the shelf but then I saw the hole.? Could they both be GM, why the hole. Any comments would be very helpful.
