955 parts interchangeable

955k engines are eariler D330 engines, scroll fuel injection 4.5 bore ,13x models have 3304 ,4.750 "engines with spacer plate block and sleve metering injection systems. torqueconverter transmission basically same ,sterring clutches same ,final drives different at board bearing support ,not sure about inner gear ratio
955k has 6.91" undercarriage ,955l,13x has 6.5 " pitch D6 undercarriage
This is from memory!

Early K's are 6.91 pitch, late K's/L's (85J10129-up) and 13X's are 8.00 pitch.

Yes , 13 X has 8" pich or D6 10K undercarriage
If memory serves my right I think that all 955k ,and 955L,s up to the last 85J ,had 6.91 " undercarriage .the only 955's with 8 pitch undercarriage was the 13x
I remember that when the 8"pitch was interduced on these tractors ,ther was a steering clutch slippage problem ,and an extra disc had to be added to each steering clutch