I have a sd 100 and need the pump drive coupling part 59815688 the part is obsolete I can not find new used or after market anyone run into this yet. I looked at a SD100d coupling looks like it would work if you change flywheel. I just rebuilt the engine and found coupling bad so I need a way to make this work the SD100D part number is59286336
Update I was able to use the pump coupling from a SD100D had to make a 11/16 spacer and redrill flywheel I could not get a part number for the D flywheel