The same Trip spring was used on all the RT2 Standard and RT3 Smart Hitch plows. Replacement OE number MSC01509 This spring measured 14-1/4" long. For the newer Smart Hitch 2 plows they also had a 17-5/8" long spring, OE MSC07705. Eye bolts to mount the springs come in pairs and sizes 1/2" x 6" and 5/8" x 4". They include the nut and washer to make a complete replacement set.