Shell latch "bracket" problem

Last time I used one, I borrowed it from a friend at a body shop.... to attach a roof rack to my old Bronco II.

Always wanted to purchase one but couldn't justify it until now.

I planned to purchase mine from J.C. Whitney.  I think they had two kits (economy and delux?)  The econcomy had a manual install tool which used wrenches to twist a screw and expand the rivet-nut.  The delux had a tool similar to what I borrowed, which expands the rivet-nut similar to the way a pop-rivet gun works.

The kit didn't seem to expensive...