I have some old part numbers I need to see if they are available. These were purchased under these #'s on 12/10/2013.
Fr Mid & R Driveline w/Gears(80 ton 3 Shay) Ho scale H81912
"O" ring (HO Shay) 819XX- H81913
Front Truck Driveline (Climax) HO Scale OAH04
Rear Truck Driveline (Climax) HO Scale OAH05
These are directly from the packing slip.
"Click" on the 'Parts and Service' icon at the top of the home page.
You should be able to find what you need if it is available.
HTH
Ken