Do these need bolts or clips to mount?

Factory attachment points are where these bolt on. Bring standard hand tools and your vehicle's service manual for torque specs and exact mounting procedure—installation varies slightly between door panels.

Will these work if my existing regulator is bent or the motor runs slow?

These are complete new assemblies, so yes—you're replacing both the motor and regulator together. If only one side is bad, you can install just that side, but buying the pair saves you a second job later.

What's the return window if these don't work out?

Contact the ModSupply team with your order number and photos—they'll walk you through the return process and get you sorted. Keep everything in resaleable condition and your receipt handy.