I have a 36mm bar to go on mine. I seems to me the clamp is dependent on the bushing being used. I don't think the GN clamps would work well with the tall factory F-body bushings. and most F-body clamps will not work, as the bolt holes are offset.
Check out Spohn Performance :: Chassis / Suspension / Drivetrain
I ordered the bolts from them (not cheap) for G-body, and Bushings with brackets for 36mm swaybar. I have not tried them yet, but they are listed under F-body parts and you must specify '82 F-body. This gets you the bracket with the holes next to each other (not offset). According to their customer service, they will work on a G-body. :biggrin: