Yep. You'll want to get the folding metal brackets and the ... umm, stubs? spindles? whatever you call the hinge points from the donor truck, but a Blazer should be set up to accept all of the hardware without drilling. Essentially, you want the tailgate and ALL the hardware, not just the tailgate.
There is an obscure option on the Blazer/Jimmy for the tailgate "for soft tops only" -- look in the LMC catalog -- which is basically a pickup tailgate, i.e. with no roll-up glass.
HTH.
-- A