Ok, so I haven't had such a great day for a while when it comes to finding much less buying, (what I feel is a deal), on NOS Mustang parts. I ended up buying the sheet metal that I had asked the stampings about and to my surprise the pair of quarters are stamped 7/17 and 7/20! The car I will be restoring next had a build date of 7/21/66!!! I feel that these would be correct for a date match?? I also picked up a NOS front left apron, NOS rear valance(although without back up light holes), an NOS right inner wheel house, an NOS radiator support, and one pair of repro outer wheel houses and another front left repro inner fender all for $1,180! The gentleman I delt with said they were from a project he ended up selling and now that he is moving he wanted rid of these. I feel very blessed to have been so lucky.