You probably looked already Pete, but there are a few on the US ebay site:

http://www.ebay.com/itm/Aircraft-Ignition-Twin-Engine-Military-WWII-Magneto-Switch-Bendix-Scintilla-/200789971721?pt=Motors_Aviation_Parts_Gear&hash=item2ec003d309&vxp=mtr

http://www.ebay.com/itm/WWII-Bendix-Aircraft-Ignition-Magneto-Switch-N-O-S-/380454128648?pt=Motors_Aviation_Parts_Gear&hash=item5894d54c08&vxp=mtr

http://www.ebay.com/itm/Vintage-Magneto-Switch-A-A-F-Type-B-5A-Bendix-Delco-Type-10-29055-/150845807266?pt=Motors_Aviation_Parts_Gear&hash=item231f1c5aa2&vxp=mtr

Hi.
Does anyone have an American-style Bendix or similar mag switch available please?
It is the Off / L / R / Both type I`m after, either with or without removable toggle / key.
It`s for the Griffon-powered Miss Canada IV:
http://www.haroldandlornamovie.com/home/miss-canada-iv-1

Cheers
Pete