This is a used OEM 16mm rear sway bar from my 2005 r53. It has about 40,000 miles on it, I think a bit less. It came off of a CA car so it's in great shape. PM me for pics. Asking $60 plus shipping. Will ship anywhere within CONUS. Make me an offer!
I gotta be honest here, selling an OEM swaybar is going to be very hard as many people will replace them with a larger one. Even when going back to stock it's almost not worth the effort to remove the larger one before selling.