I replaced factory engine bay metal in my 67 Mustang and factory fender attachment lip to avoid metal pucker when bolts attach. I could use the factory type u nuts to attach fenders, but that will leave gap the thickness of the clips. Does anyone make a die to recess the clips or does anyone have a suggestion on what I can do to attach fenders, retain fender alignment capability and not have the gap I want to avoid? I could make small plates and weld flange nuts or something, but wondered if anyone has a more clever way to do this. THANKS!