Do these mount at factory points, or will I need to drill?

These bolt at factory mounting points — no drilling. Align them to the C-pillar and use the existing fastener locations. Test-fit before final tightening to confirm panel gaps.

Can I paint these, or do they come pre-finished?

They arrive unpainted. Clean with soap and water, sand lightly with fine-grit paper, and prime before painting to match your Challenger's color. Standard automotive paint works fine.

What if they don't fit right when they arrive?

Inspect fit before fastening. If gaps are uneven, loosen bolts slightly and adjust panel position until edges align with your quarter glass and surrounding body lines, then re-tighten.