Replacing the quarters isn't too tough, but you have to be patient, and in my opinion, rather anal about alignmnet. The first thing you'll need to do is drill out the spot welds around the quarter. Ther are quite a few, and it's easy to miss some, especially on the bottom of the quarter near the post, and the bottom of the post wher the quarter meets the rocker. Once you get the spots drilled out you need to cut the quarter off (this is my way of doing things, the TV guys will do it different). Keep an extra 1/2" to 3/4" of original metal so that you can overlap the new quarter on, and have something to weld on. This is where the anal part comes in. You need to be careful about your measurements so that the quarter panel lines up properly, otherwise you get a cocked panel, and a giant pain in the butt to try to feather a bad angle in. Once you weld the quarter on, it's just some good old fashioned putty work to blend it in to the rest of the body. On my 90, I made my own patch panels. I have some pictures of the process that I can scan in and send to you if you're interested. Even tough it's a patch panel, the process is the same.