Pics of roof rack mounts?

Going to build a big f-off rack for the E350 soon, out of aluminum, probably knock off an aluminess rack style.

Would like to see details if possible on how the mounts interface with the gutter. If possible would love to see a close up of the aluminess mounts.

Also, it seems like some racks have 4 mounts, some more. I have a standard size (non extended) e350 cargo, and would think I could get away with 4 mounting points. Opinions?

Thanks!

roof-rack-gutter-mounts.jpg
 

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