Do these mount to factory points without drilling?

Yes — they bolt directly to existing frame attachment points. No drilling, cutting, or fabrication needed.

What should I do to prep these before painting?

Mild steel comes bare, so a light scuff and cleaning before primer will help paint adhesion. After that, prime and topcoat as you would any steel surface.

Can I weld these if I need to modify them?

Absolutely — mild steel is fully weldable, so you can customize fitment, height, or angle if your setup demands it.