[StingRay]

Nope you can get them off with the doors on. You will need an air chisel to get the front spot welds that are in behind the fender. It will come off in bits and pieces. You will not however be able to fully spot weld it with the fender still on. If its clean and solid you could use adhesive to attach the new ones. If you are looking to fully clean and repair everything in behind you will need to take it all apart. If you are looking at a quick or temporary fix then it can be done with fenders on.