Those look different, Vince.. they appear larger than the ones in the ebay ad.
Actually my '69 Z28/RS had what appears to be the same 'fender protectors' as the NOS ebay item (without the rubber part) when I purchased it in '76. They remained on the car until I removed a lot of items for cleaning the past couple of years. They've been cleaned and bagged up for possible reinstallation later. They are thin stainless steel (flash chromed?) parts and are almost unnoticeable when installed. I've just spent quite a while going back thru hundreds of photos I've taken of the car over the years, and I couldn't find any photos which showed them clearly (only partially). They are tucked way under, where the body rolls under, and right at the back of the rear wheels, so they are essentially hidden. They do not, and did not, appear 'out of place', but I never knew for sure if those parts were GM, service parts, dealer parts or what until today. Now I'm suspecting (based on the ebay NOS ad) that they are 'dealer OTC' parts.
I don't think I'd use them with the rubber part, but with only they stainless portion, they are not bad. Does anyone know how these parts, or similar parts (assuming they are dealer items) are considered within 'original judging' guidelines? I'd sorta like to reinstall mine, as they do provide some protection for the lower rear quarter area from gravel chips and the like...