Why Are My Fas-Top Solo Side Rails Loose on My Ford Ranger?

Updated 10/01/2026 | Published 09/24/2026

Question:

The clamps do not engage the bed rail by +- 3/4inch so the side rails move about on my 2026 Ford ranger. Is there a fix to this, i.e. blocking etc. The topper that I received has different configuration of side rails depicted in install videos what am I missing? Id send pics but packed up everything to store it until I can figure out what is going on

asked by: Rik

Expert Reply:

Hey Rik, thanks for reaching out. The first thing I’d check is that each clamp is fully engaged and sitting flush against the underside of the Ranger’s bed rail. The Fas-Top side rails need to be seated firmly against the bed before the clamps are tightened. Once everything is positioned and tightened correctly, those rails should be solid and not move around at all.

I really don’t think you need spacers or blocking here. If you’re seeing roughly a 3/4" gap, loosen the clamps, reposition the side rail and clamps so they’re sitting square and fully engaged, then tighten everything evenly. The rail design may look different from the older installation videos, but that does not change how securely the rails need to mount.

Are all of the clamps coming up short, or is it only happening at certain spots along the bed?

expert reply by: Jesse M

Fas-top Solo Soft Truck Bed Topper - Collapsible - Removable
(click to enlarge)

Rik

9/25/2026

It is all of the clamps on both sides

Jesse M.

9/29/2026

@Rik At this point, I’d loosen everything back up and make sure the side rails are sitting completely down and tight against the inside of the bed before tightening any clamps. Start each clamp loosely first, then tighten them evenly once they’re all engaged.

Rik

9/30/2026

@JesseM The universal clamps that were sent will not work. I reworked everything and there is still a 3/4 inch gap between clamp and bed. Is there a solution that y'all have or do I need to go to Amazon. I do like the topper in general but must have secure fittiment

Jesse M.

10/1/2026

@Rik Yea I agree it does need to be secure. You could try adding a 3/4" spacer or blocking. You really shouldn't have to, but that is the only other thing I can think of if there is still a gap after you reworked everything.