The storebought sway bars are for Chevies and new mounts must be made to bolt to a GMC crossmember. GMC ½-ton panels and suburbans came with sway bars that will fit pick-ups. Don't know if they'll fit a ¾-ton or not. They didn't make ¾-ton panels and I don't know if a 1-ton panel had them. Look for a 1-ton panel in a wrecking yard and look under it.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.