74 power wagon dream truck...

So I figure I need to start with these ramcharger mirrors. I looked up placement and the only thing I found was someone trying to put van mirrors on or something like that. They were saying to mount them just below the body line at 8 and 1/2 in to center but these have a contour to them as if they fit on the top body line?.. right now I'm fabbing up a backing plate for it for behind the door and also I need to find some kind of like bicycle inner tube or something and make a thin rubber gasket.PXL_20220225_173916010.jpg PXL_20220225_173359915.jpg