OK - MOST is pushing it - and still partly supposition.
The AIT sensor is almost certainly an AMPhenol Junior Power Timer (or clone). AFAIK the ones on PoleVolt are clones. I've ordered some to see if they fit.
The Headlight loom connectors I can identify as these.
Mini Lock Connector 4 way kit. Including terminals.: ML4KIT. I bought mine from a different supplier
Vehicle Wiring Products Ltd. Suppliers of auto electrical parts. and they only had white - but as Polevolt wont ship outside the UK - needs must.
I'm still working on identifying others. That 8 way connector is one I'm working on. As are the connectors for clock and other accessories.
Polevolt has ECU connectors but I don't know if they fit our ECU.
As I mentioned to Colin, getting under my tank is more complex than it should be (due to different bars and instrumentation) or I'd be further along - but I strongly doubt Triumph have the muscle of companies like Toyota or Ford to have their own bespoke connectors. AND it will not surprise me one little bit if they've used clones too.
Actual mfrs I'm tracking slowly. Some of the clones maybe made by companies like Ripaults or Durite. Though they're almost certainly from an Asian factory.
If you have lots and lots of time - start on
Connectors & Terminals, Connectors & Terminals products, Connectors & Terminals Suppliers, Manufacturers & Exporters on Alibaba.com - page 1