I have gen 1 and 2 "arms" and looks same xept minor diff in manufacturing over the years.
Bolts holding motors to the lift are different. Gen1 have shorter/longer bolts then gen2. (Don't have them to look right now.) If you have long bolts in shorter holes in motors then long bolts can cause interference w/ the arms.
Buckets etc are same. If not then someone likely bent or mod'ed them.
Other then that... post a pic to show your problem.
------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)The Ogre's Fiero Cave[This message has been edited by theogre (edited 11-17-2018).]