Need Part Number for pinion gear DF250

[ldbyrne]

I need to replace the driveshaft pinion gear ONLY on my 2004 DF250 .
What is the part number for this as I can only see the part number listed for the full set (all 3 pinion and gear) which is 57300-93822
Surely there is a part number listed for the driveshaft pinion on its own ?
2004 DF250 Serial Number 421126