Do I need to sand and prime these before painting?

Yes. The extensions arrive in raw FRP condition, meaning the surface is prepared to accept primer. Sand lightly with appropriate grit, apply your choice of primer, then topcoat with the paint of your choice for a seamless match with your body color.

What hardware do I need to install these?

The extensions are supplied as bare FRP panels. You'll need to source fasteners (typically small screws or rivets) suited to your mounting method. Consult your vehicle's service manual or contact a local shop for fastener recommendations that match your rear quarter's existing holes and material thickness.

Will these affect my access to the rear quarter panels or jack points?

These are add-on extensions mounted to the exterior surface. Verify clearance around your vehicle's jack points and service access areas before permanent installation. Mock-fit them first to confirm they don't obstruct any critical maintenance areas.