TM 10-3930-669-20 15-16.  SEAT REPLACEMENT/REPAIR (CONT). (2) Inspect all parts for cracks. (3) Replace damaged parts or notify supervisor. c.  Installation. (1) Position two brackets (16) on cab mount (17). (2) Position two screws (15) in front holes of two slide rails (12 and 13). (3) Position two slide rails (12 and 13) on two brackets (16). (4) Position lower seat frame assembly (14) on two slide rails (12 and 13). (5) Tighten two screws (15). (6) Pull lower seat frame assembly (14) to the front position (TM 10-3930-669-10). (7) Install two screws (11) in rear holes of two slide rails (12 and 13). 15-56