Hi again Smitty:
There are quite a few suppliers of sway bars and associated hdwr out there. My advice is that you buy the bar, bushings, and saddle clamps all from the same source as a branded kit. I have a factory 1-1/16 dia bar on my 76 C-20 that was heck trying to find the bushings that fit the oem saddle clamps recently: various mfg bushings fit the bar but not the clamps (see my high jinx in the suspension forum). There were at least 3 different diameter front sway bars available on the 73-87 3 trucks and I believe the 1-1/16 was the smallest.
Another thing to check: does your truck already have the sway bar brackets attached to the frame?...if not, you will have to get these installed and they are not typically part of a sway bar kit.
Some new sway bars come with solid polyurethane bushings instead of the original style rubber bushings...I cannot comment on if these are better or not or what their selling feature is.
Regards,
Henry