Per the Monroe Shocks web page, they list only one model of shock for the front of my 01 RWD Trac and that is the Sensa-Trac Light Truck shock, Part # 37177. For the back, they list 3 different part numbers; # 58617 which are the Sensa-Trac Load Adjusting Shocks, # 911035 Reflex Light Truck...