I purchased my parts from the local IH dealer. I opted to put a wheel bearing in the top of the tube instead of a bushing. I also found where you can buy the little ball bearings as a kit, much cheaper than buying the part #'s associated with yours: IH-71930-C91 (about $10 total instead of $30+).
I haven't got mine back together yet, just got the parts today. I also ordered the pin and I'm waiting on a thrust bearing and washers to do the super upgrade you read about. I had my local bearing supplier oredr it for $3.48 and the local Grainger get me the thrust washers for $.96 each. Much better than the $16 - $25 to order it online.
You can see my new column here:
http://www.onlycubcadets.net/forum/s...3184#post23184