Deereman
Guest
As far as I know, the 643 should fit. If it is an older one and your 9500 has a variable speed feederhouse there may be clearance problems with the gearbox. I forget the serial number break but that will tell if yours is a new or old style 643. I bought an older 643 and it had already been modified to clear the box on my 7720. Hope this helps.