Where is Case 580 Super L Rear Differential Part Number ?

I am going to change the fluid in the rear differential and planetary drives on my Case 580 Super L Backhoe. I found a reference that says the oil requirement is different depending on part number for the rear end on these machines - Axle Numbers 114367A2 and 114367A3 use MS1317 oil which is and 85W 140 with friction modifier. Axle numbers 114367A4 and later use MS1207 which is a HyTran Fluid.
I looked around on the rear differential but haven't found the part number yet...

Where is Case 580 Super L Rear Differential Part Number ?

Where is Case 580 Super L Rear Differential Part Number ?