Selling as the base ring ring oval didn't work for me, just too tight. Bought on here just a few months back. Did end up with a BAWR with a larger ring and a tether. The measurements from the sale: Base ring - oval. 1 15/16" at the wide width, 44 mm the other direction. Cage ID - 1 1/4" Cage length - 1 7/8" but I measure it at 2 1/4. Gap - 3/8" Has the security screw. $250 USD, shipping in CONUS included. Anywhere else, you pay and set up shipping and send me the label.
The base ring. Is their measurement 1 15/16? ie…how it was ordered? I guess same question for length.
My measurement is 50 mm wide on the oval. My guess is internal versus external on the length. I didn't order it so I can't answer that, obviously.