I am thinking 13WX78KS011 instead of the S04 at the end.there was more numbers next to it---317740.
That is correct for the front drive belt. if you are replacing the drive belt you need to replace both the front and rear drive belts at the same time. So you will also need 954-04208A. Otherwise you will through the sync of the belts off and it wouldn't operate the speed changes correctly.Yes,U right that M. number is 13WX78KS011.I check Parts Tree and belt number ---954-0467A.Is that good number?Thanks Illinois engine.