TM 9-2320-209-10-1 f. Usable on Code. Usable On codes are given to help you find which component items are used on the different models. The codes used in these lists are as follows: Code Used On A All trucks AA AB AC AD AE AF AG AH AI AJ AK All trucks w/winch Model M35A1 Model M35A2 Model M35A2C Model M36A2 Model M49A1C Model M49A2C Model M50A1 Model M50A2 Model M50A3 Model M109A2 AL Model M109A3 AM Model M185A2 AN Model M185A3 AO Model M275A1 AP Model M275A2 AR Model M342A2 AS Model M756A2 AT Model M764 B-2