Cant find diy van high top install help

I am building my second camper van “89 chevy g20” and i have a high top for it but cant seem to find any good diy install articles or vids. only have found a few vague articles and one vid of a newer style that wouldnt apply and its pretty vague also. anyone know of any ?

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If you look at the inside of top, there might be a flange that you screw down to the roof all the way around.

The other type require ribs to be attached to.

Put butyl tape between the top and the van.


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