"C4" suspension code on my fender tag

Thanks for the response. I bought a 15/16" sway bar kit from a forum member which I think is what is right for the GTS. I was just curious since the 1-1/8" was in the trunk with the stock style 1pc metal sway bar bushings that bolt to the K-frame. Torsion bars look like 7/8" diameter. Unfortunately, the 6 leaf springs were gone. It had a set of super stock springs in it so I just reused those for now.