Verified answer

The holes that you see in this quarter panel are not bolt holes. The holes are where the top of the quarter panel attaches to the roof. They are sometimes molded and attaches with lead or panel bond. Installing a quarter panel is a big job. You have to drill out all the spot welds that attach the old quarter inside the door around the wheel well and along the sides of the trunk deck lid. These are the factory spot welds. You can see them as little dimples all along all mated surfaces. You then fit the new quarter panel and weld the drilled holes closed to hold the new quarter panel in place. You can also use panel bond to install it but the guns that dispense it are quite expensive as is the panel bond. Panel bond is a two part epoxy that you just run a bead and then clamp it in place until it drys.

Good luck, we are in the process of installing a set of quarters on a 71 AMX and they do not fit all that well. We are having to make quite a few modifications to get them to work. That is a problem that you will run into frequently with after market parts like these.