I made my own. I made a frame out of 1/8"x1" aluminum that bolted to the factory holes (the ones for the visor and on either side of the mirror if 2nd gens are the same as a 1st). I then put snaps on it and a piece of vinyl that went over the roll bar. I put gromets on the back of the vinyl and tied the back down to the bed rails. The way I did it there is a small gap in the front but it is covered by the visors so it is no big deal. I did this because I want to install a full soft top sometime but don't want to have 2 sets of holes in the windshield frame. If you have any other questions just ask.
'71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
<a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>