That’s simply arb doing what arb does best.
Getting you to buy more ARB Products.
Think from memory everything you Mount to it is UNIQUE to their dovetail design.
I have not seen anyone else run anything similar.
You can Mount the likes of Thule and Rhino rack but wait you need a dovetail adapter from ARB
Bite the bullet buy the bracket you need from them
They should have them on the shelf if they are worth their money.
That’s the ARB way.
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