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is there a special tool made specifically for the retainers that hold the glass to the mount?
They look like they use a spanner of sorts but not sure.
Anyone does this before? what was used to loosen and remove the 2 "nuts"
Most any quality "older" auto glass shop will have the correct spanner as all of the older window rollers used the similar attachment. Best I recall there were two sizes. I don't ever recall the tool ever being mentioned in a Corvette FSM.
Google "Camaro window roller tool" or "window roller spanner gm"
I just use channel locks. The glass is also bonded to the hinge.
Most of the older installs that bond has already failed. The spanner if someone is doing a removal and a replacement is certainly the preferred. Use a pair of dividers, measure the spread and make your own. Works real well.
Remove the halo panels and take the entire hinge and glass from the halo bar. I believe all of the nuts on the bottom of the halo are just standard hex.
I had one of those "spanner" nuts break the plastic stud off on my hinge years ago. Called up Corvette Salvage (of PA?) and asked for a hinge. I was told "it's part of the rear window". I said, ya I know how much for the just the hinge? I got it for like $20 it even was the the same color. Put a little heat to it with a heat gun and got a putty knife under the edge of the hinge. Propped it up a couple of inches and laid blankets all around the bottom edge. Left it over night like that with putty knife stuck in it and the glass hanging. By next morning it had separated by itself. Bolted my new/used hinge on, some butyl tape between the hinge and glass, and used a pair of needle nose pliers to spin the spanner nuts on.