MB OEM Roof rail nut inserts

downunder

Active member
Does MB (or any other business) offer a spring nut insert for the OEM roof rails please?
I have looked in Search area and couldn't see anything specific.
Generally you drop the nut into the rail and turn it 90 degrees to pull up to the inner edge of the rail.
I wish to attach solar panel supports.
Rhino Rack spring nuts M6 or M8 thread holes are too wide. They also are the same physical size as electrical Unistrut type products.
I'm assuming that there is a correct available fitting, part number etc to achieve this?
Thankyou
 

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