Well, I was in the very same boat as you were, until just today. I needed the same Drive yoke, and after alot of searching I found TWO!, They are by no means inexpensive, but I purchased two in order to try and get a deal, as they are used.
NO NEW CV's are available as per Agco's data base, and no dealers are showing any in stock in North America.....period. They are listed as part #3436940M1
Although I did find a few more, most of the salvage dealers were only willing to sell me the WHOLE 4x4 axle, (plus shipping for average of $3,500@!! Just to get the CV Joints out of them!
I can spare one, (I hope), and if you want it just send me a email back, and I will ship it to you. Not to worry. I am just a farmer, not a dealer looking to get rich.
I might ask, did you ever find out what models of mitsibishi cars were also supplied with this joint? I might be able to save some cash if there is a next time.
fallscreekfarm@wmconnect.com