Funny! I've got the same damn thing! Took a coons age to find the gears. No luck yet on a four jaw chuck. There's a guy on Ebay who sells new made steady rests.
I bought a 1 1/2" headstock & plan to rebuild someday. I hate putting too much money into it because of the tiny thru hole making it useless for many barrels. I do see 4 foot beds on Ebay also.
NEW TELESCOPIC STEADY REST FOR SOUTH BEND 9" LATHE - eBay (item 400048686247 end time Apr-03-10 21:21:06 PDT)
BTW; I have not found the oddball reversing gear yet either.