ENGINE 900.9 in MODEL 970, 972, 975, 976 ENGINE 902.9 in MODEL 950, 952, 953, 954 ENGINE 902.9 in MODEL 957 except CODE (MS8) Natural gas engine ENGINE 902.9 in MODEL 970, 972, 974, 975, 976 ENGINE 904.9 in MODEL 375.1, 958.0, 970, 972, 975, 976 ENGINE 906.9 in MODEL 374.5, 375.3, 950, 952, 953, 954 ENGINE 906.9 in MODEL 957 except CODE (MS8) Natural gas engine ENGINE 906.9 in MODEL 958.0 ENGINE 906.9 in MODEL 958.2 ENGINE 906.9 in MODEL 970, 972, 974, 975, 976 ENGINE 924.9 in MODEL 958.0, 970gf3030w310802ma