I recently picked up an 86 Longbox 2WD with low miles and scored a topper for cheap as well. I have a few questions as to how other have installed toppers on trucks with the railside beds such as this:

There is no lip on the inside of the bed rain to use a standard clamp. It looks like the previous owner of the truck may have drilled holes to mount a topper? The topper i have came off of a 78 Toyota longbox and i don't see holes in it... Any input would be much appreciated. Thanks!

 

Drill and bolts