It's fairly easy to see how much stronger the new trailing arm is compared to the stamped steel stocker. This means that our caster settings won't change under hard cornering. They are fabricated from 1x2-inch steel tubing and 3/16-inch CNC-cut steel plates. We went with the fluted, grease-able, low-deflection polyurethane bushings, which are far superior to the rubber OE bushings. BMR also offers a low-friction, Teflon-lined spherical bearings version (PN TCA027, $239.95).