I think they are all bent in one way or another...lol. Are you talking about the jackshaft base plate? I have 2 of these bikes and both jackshaft base plates seem to have the same bend in them. If you install the clutch and put a straight edge from sprocket to sprocket it isn't far out enough to be a concern.
I know they are not very well made. Before I ran the bike I went over what was there. Removed castle nut on the jackshaft gear, lock tited and tightened. It was loose brand new. Removed the tensioner, sanded surfaces and greased. Removed the roller, wire wheeled the mass of rust (again brand new) off the bearing shaft surfaces and lubed. Also had to tweek the roller to chain angle.
You could order one from Coleman but they are $60 and they will rape you on shipping. I ordered some hardware from them and it took just over 6 weeks to arrive.
Good luck in your search.