raney

Just picked up a 82 xs400 dohc and upon inspection noticed the rear shock seams to be worn. This is my first motorcycle so I'm not sure if the shock is rebuildable or if i can simply readjust it into spec. Also, I've searched for a new replacement piece but they're discontinued. I've seen some old ebay listings with used shocks, but would rather stay away from that if possible (dont know what i'm getting). Are there any recommendations as to aftermarket pieces or shocks from a different bike that'd work. Just want to see if there is someone out there who has figured it out already before I start busting into it. THANKS!