I have added the link to the latest amendment to the Alternative Parts List that should be available in the next few days, on the link at the top of this forum. The part number to search for is PF4C/00, it's available from other suppliers as well, at least in theory.

A PF3C/00 will physically fit, seems to be more available and will probably be usable if that is all you can get. The voltage/throttle profile is slightly different, it's used on Ducati engines. Some Ducati owners have fitted the PF4C/00 and say it makes little difference, so it may be the same the other way around? It would be useful to know if they are interchangeable in operation as well as fitment if anyone has used a PF3C/00.