Sorry cannot work out what you are trying to do exactly.
The adaptor is for a Fuji canera of some variety - Fujifilm X from the description.
Assume you have a Fujifilm X - not stated but if not then not the right T ring.
Assume that you have then I assume the lower surface we cannot see has a bayonet fitting to mate to the camera.
The upper surface thatwe can see is apparently the usual T2 thread. And there the fun starts - number given seem to imply a 52mm whereas T2 is 42mm. Although in the Detail section they do have a S52/T2 adaptor mentioned.
Also I keep seeing "Astro T-2 system" quoted.
Have to say "Why do I get the impression that this is Baaders Astro T-2 system that matches no one elses ?
Likely need a more detail of the equipment in use but finally as the adaptor is described as Wide it should I expect move the camera away from the reducer whereas you say "I wanted to mount my 2" focal reducer to it, so it is closer to the camera sensor.".
Reducer+Wide T adaptor means greater separation from Reducer to Sensor.