Will these fit if I've already modified my tail light housing?

These mount at factory points, so they work best with stock housings. If you've swapped in aftermarket lights, verify that the mounting tabs line up before ordering.

Do these need paint or clear coat before installation?

They ship in black finish ready to install. If you want a different color or want them to match a custom paint job, prep and paint them before mounting.

What's the return window if they don't fit right?

Check the return policy linked in your order confirmation. Test-fit them before fastening permanently so you can verify alignment.