Sway Bar Kit: 64-77 A 1 3/8" Chevelle, El C, GTO - FRONTThis is a NON factory EXTRA Large 1 3 8" front sway bar.. the largest GM put out for these was 1 1 4".. so this is more competition born rather then optionally factory large etc. Front sway bars came in various sizes.. mostly from 15 16' , 1 inch, 1 1 8th, 1 1 4" . but the largest factory unit on some of the late to be especially released were often 1 1 8th, 1 1 4" . So this one at 1 3 8" is bigger again and about as big as you can fit period. Fits: