My buddy has an 07 Specialized S-works FSR and the Specialized AFR brain shock has crapped out. The bike store will replace for $500 (new shock), but he is loath to put that much money into an old bike. Is there another shock he could use that he could pick up used? I've done some sleuthing but I can't figure it out, I'm hoping someone with some knowledge on this might be able to offer some insight. It looks like it might need to be adjusted for stroke, but just trying to see what his options are. Any input would be super useful.