Help with kingpost JCB 3c

[bobtheburn]

Help, please ?
I have a JCB 3Cmk 2 and the splines have gone on the inside of the king post also the teeth on the rack are in pretty poor shape.
I have access to another old JCB,I don’t know the model or year but the king post looked the same except that the hydraulic pots have a smaller diameter,
Does anyone know if they are interchangeable please ???

[v-e-s-a]

Hi, I think, one is STD 4,5 and another is HD 5 version...