Looking at buying additional accessories or making some for my car's roof rack, which uses Whispbar brand crossbars. I'm wondering if other brands use the same size t-track slots and whether they'd be interchangeable.

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That's a bit short for an SE answer but it pretty much covers the problem, there are various manufacturer specific sizes and no standard. Some parts providers such as Thule sell accessories and adapters to allow a greater range of compatibility.

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