4. The RMS K-member bolts to the stock frame with the four stock k-member bolts. No cursing, no banging, no prying. It was a perfect fit on Project Valiant. The K-member is made from ⅛-inch-thick square mild steel tubing while the shock tower portion is ¼-inch-thick laser-cut plate steel. It’s about the same weight as the stock K-member; the huge weight savings comes from the rack-and-pinion, control arms, and spindles.