I am in the process of rebuilding my machine, while I am at it I figured it would be a good time to add side shift if possible. I have the parts and service manual for my S30C but there is no side shift listed as an additional option. Although there is no side shift listed, there is several versions of the control valve in where there is a 3 and 4 valve control unit listed. The mast is a three stage, and is about to get new bronze bushings and bearings if they need replaced. Has anyone done a side shift install on a 1978(ish) S30c? The lift serial is A10D13777, the data plate is of course missing so the serial number shown is the one from the frame stamping. The mast information is as follows:

6382
172.5"
215480
10-76
D