Model 7 cam sprocket.

I got a call from an old friend who has a friend working on a iron Model 7. Asked if I might have the cam gear for his bike. This one has the sprocket for the cam and a gear that drives the dynamo. Sort of reminds me of the intermediate gear and sprocket on a Commando. Checked RGM and Andover Norton with no luck, but at least the Andover site showed a picture of what he is looking for. Any idea where he might look?
Thanks in advance for any help that you can give him.
Cheers
John in Texas