Where to go for parts?

Been quite a while since I've searched for parts. I know Fred and Ella are retired, which was a shock, dealt with them for years. Not that long ago, bought some electric parts from Greg Marsh. I need a new Stop lamp switch, Norton parts Number 34815. Any info. would be great. Thanks Robert TN

In the US: JRC Engineering, Greg Marsh, Klempf's, Classic British Spares, and a whole lot of other places that don't immediately come to mind
In the UK: Andover Norton, Norvil