The quarter bend is threaded and has, at the threaded end, an exterior diameter of approximately 2.5" while the pipe itself is more like 2.375" OD, so I believe this is 2" PVC. It is cemented to the pipe coming from the wall.
I have been looking online and have not seen J-traps that are made to fit this pipe. Do I need to do something custom here? Is there a product that can help?
My best guess is to just cut the pipe closer to the wall, then install a reducer with a compression fitting, and then an off the shelf P-trap kit.