2628DB traction bar pivots are required when using the 3/4" relocation position on UMI 2624 brackets or other "Herb Adams mod" style brackets.
UMI Performance 70-81 GM F-Body Traction Bar Pivots (for 3/4in relocation)
1970-1981 GM F-Body Traction Bar Pivots (for 3/4" relocation)
Traction Bar Pivots