has anyone used Surco roof cross bars??

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I've seen people using the Surco racks, but what about crossbows? They are like $70/pair plus the $50 brackets to mount to the roof rails.

Does anyone know if they fit well? I am looking for something to just put up there to mount a high lift jack to, instead of buying the GM roof crossbars.

can be seen here:

http://www.autoanything.com/roof-racks/69A2323A0A0.aspx



Thank you