Parts catalog K21 Komatsu: 37B-1DA-5321 K21 ENGINE, NON-EPA, GASOLINE Komatsu 37B-1DA-5332 K21 ENGINE, NON-EPA, DUAL FUEL Komatsu 37B-1DD-5010 K21 ENGINE, GASOLINE, TIER 1 Komatsu 37B-1DD-5020 K21 ENGINE, DUAL FUEL, TIER 1 Komatsu 37B-1DD-5110 K21 ENGINE, GS, TIER 1 Komatsu 37B-1DD-5130 K21 ENGINE, LPS, TIER 1 Komatsu 37B-1DG-5512 K21 ENGINE, GASOLINE, CARB 2010 Komatsu 37B-1DG-5522 K21 ENGINE, DUAL FUEL, CARB 2010 Komatsu 37B-1DG-5523 K21 ENGINE, DUAL FUEL Komatsu 37B-1DG-5532 K21 ENGINE, LP, CARB 2010 Komatsu 37B-1DG-5533 K21 ENGINE, LPG Komatsu 37B-1DG-5610 K21 ENGINE, GS, CARB 2010 Komatsu 37B-1DG-5620 K21 ENGINE, LPS, CARB 2010 Komatsu 37B-1DG-5632 K21 ENGINE, DUAL FUEL LPS / GS, CARB 2010 Komatsu 37B-1DT-3011 K21 ENGINE, GASOLINE Komatsu 37B-1DT-3021 K21 ENGINE, LP/DUAL FUEL Komatsu 37B-1DT-3111 K21 ENGINE, UL-GS Komatsu 37B-1DT-3131 K21 ENGINE, LP Komatsu :