Source for extrusions similar to the Alu-Cab crossbars?

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Anyone have a good source for an aluminum extrusion similar to the Alu-cab crossbars?

When I bought my rooftop tent, I bought the standard crossbars and a set of the low/shorter ones. The two standard crossbars were for mounting to my rack and the two low ones were for the top of the tent for a mounting surface (I will probably put solar panels up there). But, when I mounted the tent, I ended up using one of the shorter bars as a mount to make the tent super solid.

So, now I'm left with one short crossbar, and am short a crossbar. But, the good news is that I have all of the "low" mounting hardware so if I can find a similar extrusion, I am all set.

The bars are made to put a carriage style bolt in the channel on three sides where things can then be attached.

I can take and post a profile picture later.
 
Have you checked the 80/20 type extrusions? They have a variety that is slotted on three sides. Word of caution with using carriage bolts in aluminum extrusion: put too much torque on the bolt and it will deform the aluminum allowing the bolt to spin freely.
 
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