From my experience, I have only seen the thick ones on Stallions. 6 cars with a 11/16(.6870-.6880) antisway bar: 2-72 V-8 Grabbers, 72 V-8 2dr, 74 250 2dr, 75 200 std 2dr, 77 v-8 2 dr. The 77 parts car has every option that I know of, but has the thin bar. 2 7/8" bars both from V-8 Stalllion std's(76) Steve