Based on that drawing, it looks like this nut would fit, $5 each is a bit steep, but that's McMaster's price. If you can find the OEM, they're probably a bit less than that.Additionally, I've attached the schematic of the roof rail. Converting to freedom units, it looks like the rail internals are 0.2 inches wide x 0.5 inches tall.
And I think it’ll fit standard 8mm bolts, which have a 13mm wrench flat.
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