Yes, use the top hinge position & the door striker plate position, measure
10 times, cut to fit once, and make them bolt in if possible, you never do
know when you may need them again, tailgate bar would also help, across
the top of the bed, to keep the sides from flexing out, if you do all of that
you might get away w/ leaving the top off, but I would still leave it on, a
Blazer windsheild / firewall section is the easiest thing that get tweeked