Typical part numbers follow this sort of format
SPFW9, RC261, D50857, 0004137, 9805881, 84410, 54925-000, 10002333
but there are several variations. If you can't find the part number then you can search on the name like 'upright' or 'shaft'. If you just want all the parts listed for a particular model then just input the model number or name.