1 - American made 4130 Chromoly Uniball Cups For 1" Bore Uniballs, Cup width 2-1/2" Tall 2-5/8" Outside Diameter 
1 - 1" DFI Heat & Cryo Treated Uniball/Sapherical Bearing 
2 - Misalignments with a 19mm Bore 68mm stack height
1 - Snap Ring for retention

This is the best combination to suit a trailing arm set up as it will only allow minimal role so will save your shock ends.

This is a set up commonly used on Trophie Trucks and upper end Ultra4 trailing arms