Need help BAD!! IHC 2-hole Corn Sheller

Link href="http://www.tractorshed.com/gallery/iphotos/i2915.jpg">Link

Hey Guys, I need some help BAD on this corn sheller I just picked up yesterday. I didn't know that IHC made a 2-hole box style all-steel sheller until I saw this one. Unfortunately, 3 of the gears are broken or missing. I'm not too worried about the chain sproket on the very end that drives the cob elevator as since if the replacement is a different diameter, it won't affect anything just spit the cobs out faster. However, the large gear just behind the flywheel is broken in half and on the backside (non flywheel side) there is a small gear that is missing altogether.

Does anybody have any information on what model sheller this is (so I can get a manual for it) and more importantly where I can find these gears? HELP!!!! I have more pictures under the implement photo gallery.

Thanks a bunch;

Jeb