RTT mount question - 2001

[lyonmat]

Bought some Gamiviti roof chanel towers mistakenly thinking could mount RTT directly to without crossbars. The cheap Tentbox 2.0 picked up off FB Marketplace will need crossbars as its too narrow. . Looking for least expensive cross bar setup i can bolt on. Maybe I'm cheap just surprised its $300 for cross bars only. Cant seem to find any other options though.
Any thoughts appreciated.

 

[Deflagrate]

Get aluminum extrusion in your preferred profile and make the cross bars yourself.

 

[Trapper50cal]

That's what I was going to suggest... ^ ^ ^