80/20 roof rack build

[Nightbrew]

Ah-ha. The blue inserts just snap in from the outside. They can also be pulled out when needed.

I'm a little curious if they get brittle after a while. I have had these in for several years and haven't lost one, but you can see a couple are losing grip perhaps at the tail end. Someday I'm going to pop them out for an awning mount, then if all goes well, cut and reinstall. The blue ones are a harder plastic. The top has a black softer rubber insert to provide better slip resistance.

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That's exactly what I was looking for. Thanks for such a quick reply.