That's what it is. I have one back at home that my dad pulled off an old one ton ramp style car hauler. They had mounted it under the bed with the drum running horizontally. It starved the big aluminum gear of oil and the worm gear stripped the teeth off. I called when they were still in business (tells you how long ago that was:sombrero

and the rep asked me how many splines were in the center of it. After I told him he was stunned that it stripped off. He said that was a 12000# winch and wanted to know what I was pulling.
After I explained it to him he laughed for a good bit. I never ordered the gear and they went out of business. I later found a replacement and had my uncle cut the splines in it for me. Have never got around to making it work or mounting it up. Might have to when I get back to the states and mount it on my old Blazer.
BTW the spline count was 14 for the 12000# model IIRC. Hope you make it work as they are great winches. The have no need for an external brake due to the worm gear drive. They mount lower and dont block the airflow as much. The drum holds a LOT of cable.
Best of luck! Sweet score:victory:.