Best I can find this came on 100hp commercial(1984-90)120 hp(1985) and 140hp v4(1985) Has 15 tooth spline,4 3/4"gearcase.all other dims same as my 78 v4 140,bolt holes etc.can anyone help with identifying as I want to change it from xlong to long shaft.need part number for long(20") driveshaft. thanks