So, I now have a complete set of controls.....
.... except I don't. I'd been think about how or what was used originally for the horn and kill switch. I believe the switch above is TY175, but have realised that the TY250 has the same switch, but incorporating a horn button. So, I have this to refurbish and use instead:
As for the engine kill button - it seems I'll also need a TY250 part. Found (but not bought) this throttle with kill switch on eBay ($200 !):
It looks a neater solution than the seperate 'afterthought' kill switch. Mine shown below
And a different TY250 option below.
I'll see what comes my way first.