After a long search, including e-mails to Yamaha, I could not find the original part.
I went on the Ogura web site and found a drawing of one of their clutches that seemed to match the one I took off.
The one I ended up getting was an Ogura MA-GT-JD11. The only issue was the electrical connector did not match the original, so I cut the connector off the old clutch and soldered the leads on the new clutch.