Lol. OMG. Let me tell you. Yeah, parts are hard to get unless you are very creative. Best way to describe a Sterling would be if Ford and Freightliner had a illegitimate child.
Cab, body, interior, wiring, accessories are a no go. Engine, Trans, suspension is the regular stuff. Except steering and front suspension, that stuff is available, but difficult.
I kept a unit in Haines going and one in Juneau. What a nightmare. Company finally allowed me to give them both away when the frame broke on the JNU rig.