I am not sure about it, I drilled 2 holes on the floor and used 5/8 ss botls and big washers. At the top, to not upset the trimming I secured the cargo barrier with 2 long bars using the baby seats anchor places on each side leaving the center free just in case.
It is very solid, believe me.
Cheers


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im not going to be carrying wally heavy items up there anyway 
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