Product details:

For 26 9/16 Bars, Pair For Volkswagen and VW based Dune Buggies Adjustable swing axle spring plate. Stop having to adjust your ride the old fashion way. Use these adjustable spring plates to quickly and easily adjust your suspension to suit the terrain or passenger count. Requires 2 inches i.D. Inner bushings & 1 7/8 inches i.D. Outer bushings. SOLD AS PAIR. Spring plate lengths are determined by the length of the torsion bar that they are attaching to. If you look at the torsion housing and the cap at the end is solid then you need 21-3/4.