These rings are original equipment with Astro-Phyiscs Travelers. I have replaced these rings with custom units that better support heavy duty astrophotography, so I don't need these rings anymore. I have never seen such rings for sale, because Traveler owners almost always keep these rings with their scope. A-P does not even list these rings as a part. The sliding bar is listed as part SB0800.
These rings will fit any scope with a tube diameter of 4.25" inches.
Condition: Excellent Plus.
Price: $85 or best offer, including shipping in CONUS.