Do these fenders bolt directly to the existing door jamb and frame points?

Yes. These fenders use factory mounting locations, so you can unbolt your OEM fenders and bolt these on without drilling new holes or modifying the frame. Just verify your door jamb hardware is in good shape before installation.

What prep work do I need to do before painting?

Sand the surface lightly to remove the gloss coat and create tooth for paint adhesion. After sanding, wipe clean with a lint-free cloth and let dry fully. Then apply your chosen primer and topcoat system following the paint manufacturer's instructions.

Will these fenders require any adjustments for door clearance?

Compare the outer edge of these fenders against your door edges once installed. The GT350 profile is wider than stock, so you may need minor gap adjustment at hinges or door stops depending on how your door hangs. Use shims under the door striker or hinge plates if needed to dial in even spacing.