Rotary mower with Warner Auburn gearbox.

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I am hunting for any brand mowers with the Warner Auburn gearbox mine is a WA-47, but I'm not picky. This is the style in image. It was put on many different brands & models. The 1½" input shaft & 22 tooth gear is the snag i can't find(image). It's one piece, and has two bearings on one side of the gear, & doesn't have one on back side. Ive send pics with measurements to a few machine shops, & the best price is about $2000.00 way too much for me.

 

[DR1]

Any help or advice is welcomed. I have a regular gearbox to replace it, but it will take some modifications to get it mounted.
Thanks again.