#1 Contact Woody and see if he has what you need.
#2 If he doesn't, let me know exactly what you need, and I'm pretty sure I have it including the full seat base if that's what you want.
Pick a number(s) from the diagram, or post a picture of what is broken.
#3 If it's just the small plastic lever, #13 in the second diagram, I bet you can get it new and cheap from a dealer or Pelican Parts. Part no. 986.521.627.00 Handle, height adjustment - for the left side.