Last photo is for reference only, this part is not included.
Tested, sounds excellent.
Measurements:
Flange outside diameter is 4-1/4", inside diameter 2-7/8", screw spread is 2-1/2" or 3-1/2" across.
Number on the back is: CD-3019
I took it out of a working Pioneer CS-G203 speaker system, everything else is also in working condition please see my other matching parts.
4194-2