I've seen that bike before. Luckily Honda did officially import the NC30 model into this country so bits should be obtainable through official dealers and failing those the likes of Dave Silver Spares or those specialising in imports like Elliots.
I have a 12.8mb parts manual in PDF I can email if your interested
Very interesting to see a Triton there as well, even if it is still registered as a 1954 Norton 650, but at least its on the road. Very nice looking blasting cabinet and spraygun too