UH-1F Huey help

Hello,
I've looked 'high and low' but cannot locate a Speed Decreaser Gear (SDG) to
fit a T58-GE-3 engine. I believe this motor originally flew in a UH-1F Huey.

The SDG needs to be complete, in running condition but does not require
'air-worthy' paperwork (as this for a 'non-aircraft' application) as
detailed he http://www.weldingfaq.com/turbine2.asp

If you know where I can purchase a Speed Decreaser Gear from (or with) a
T58-GE-3 engine please e-mail me direct at larry at skagitmedia dot com
(or edit the reply address)

Thanks!
Larry