Side shifts on forklifts are typically added on after build with such companys as Cascade- which is mostly the brand I see, usually built into a completely different fork carriage. If you want to buy a new one find the mast number, usually stamped about shoulder height on the outside of the mast and contact Cascade, maybe they still offer a carriage w/side shift that will fit the that mast. OR find a used lift at a lift salvage yard of similar size with a compatible mast. As far as controls you can use a multifunction dual solenoid and use one spool for 2 functions, say take tilt spool, push a button mounted on control handle and now same spool works side shift. That being said that size lift usually do not have side shift-at least what I have seen- as you usually can side shift good enough in most cases by cranking the wheel one way or the other :)