Have a look here: http://www.triumphtwinpower.com/triumph-twin-igniter-info.php for part numbers. If you have an 865, you can go for any 865 part number for an America, Speedmaster or Scrambler, they are the same unit with different part numbers.

Mike (UK) _____________ 2008 Bonnie Black Special 2010 Speedmaster https://www.triumphtwinpower.com