Hi, how ya doin
Freefall150, I replaced both rear outer wheel houses & quarter skins on my 69 Coupe about 8-9 years ago & the only place I had a problem was with the quarter skins where they meet the rocker panel in front of the rear wheels. I had to re-bend the lower part of the quarter skin as it was a little long. Here are some pics of when I did them. IIRC I purchased them from CJ Pony parts. I cut the small section that would have been the top of the quarter skin & flanged the top of the side so it fit under what was left of the old quarter panel. Then I screwed it together to test the fit one last time then painstakingly welded it together.