Product: Illustration: Package: Instruction: Specification: The ball link are manufactured utilizing POM material, sleek surface, with superior anti-wear characteristic. Use for T-REX 450DFC(H45162/45162QN). Must use with H45165A - will not work with older Trex 250 DFC systems. For older Trex 250 DFC systems, please use part number H45182. 450DFC Linkage rod A × 4 450DFC Ball link × 4