MTD 38" Cut auto drive selected models. 42" Cut PTO to deck belt for 600 series ride on lawnmowers including 42" Cut auto drive (Two belt deck models). 13AABD4F401, 13AD60BG300, 13AG619HO22, LT14A AM604F, LT15A AM604F, LT16A AM604F, LT17AB 2DB BK608G, LT18A 2DB AU604G, LT18AB AP608G.