4 Spring Aluminum Arm Kit (Pin to Pin) - Tarp Bow and Pivot Pin Sets. This kit contains everything you will need to install a completely new arm set on you truck. Whether your repairing a damaged arm set or just updating your truck or trailer this kit has it all from Pivot Pins to Springs, Lower Arms, Upper Arms, Cross Tube, Tarp Centering Flanges and all required hardware. This Arm set is used for trucks up to 23' in length