Ain't That a Niche
If you have a Roomba and strip out a square brush drive socket like I did, good luck trying to find replacement parts on iRobot's site.
If you peruse the forums, there is the usual advice "try ebay" from other Roomba users, however one enterprising fellow, Chris, has set up a business around this, the Roomba Exchange
Unfortunately I'll need to buy the 6-gear kit, for almost 1/3 the price of the original unit. That sucks... ;)
