http://forums.m29cweasel.com/forums/forumdisplay.php?f=4
I got my last one from Rob Walsh. Great guy and very resourceful.
Also got one from Sam Winer Motors in Akron Ohio who has a box full as of 25 years ago.
Also liberty auto restorations, but I know nothing about them.
http://www.libertyar.com/Content/WeaselParts.aspx
If you find any extras let me know I have had a search going for years. Also dds said he knew of many in AK., but never said how to get them.
I been needing to find gears for them, the small low speed trans section input gear specifically. Joe Pellegrini suggested Rush Gears to make them but at $300 each I'll just have to wait.
All that said it is hard to wrest one from the restorer enthusiasts. And I have a top price I'm willing to pay, whereas you may be able to pay more than I can for one.
Look back though this forum and you will find several M29 diffs.
Buy the Imp that has one, just posted recently.
-Pat