Hi Steve, I use the Nelson brand hoses sold by most venders in USA. Canada I expect is same.
Sadly I've not been able to find the original style front stop light switch itself so separately. Too bad. I snap up any I find at swap meets.
My feeling is most the switches were accidently broken by owners taking the switch apart & lost control & broke the plastic. Once they understand how it attaches & the little fiddle it takes to wiggle it out they do fine. Of course by then it's too late. At least the flippers & buttons are sold separately. Even though flipper blades look similar the cam on back side is specific to application. So you can't willy nilly mix & match.
In their older years corrosion, shrinking of plastic causing loose rivets can make them go open circuit. A good plan to drill 3/32 hole in lowest part of switch casting as needed to let the water out. They take lots of water inside in the rain. I've had my lever/master off several times for various reasons. Including replacing master cyl. The switch is still working fine. If switch is not fractured too bad they can often be repaired. I still think it's too bad they don't make the switch & you could just solder it in.
The SPARX one is commonly sold. Genuine Lucas
NOS is still available from a few venders or eBay. Good used switches come up on eBay on rare occasion. Bonneville Shop states the switch shown in their photo fits 73-78. Not true. '73 & 74 are different. On those years the kill switch is push button on left console, the flipper blade is high/low beam.
As Tridentman stated, Triumph added hydraulic switch in steel piping between trees. A better way in many respects. The top tree casting is different on these later bikes. You'll have to do some fabricating to add switch between trees, but a really good plan to do it that way.
If you have the banjo fitting on top brake hose, it's very easy to install a pressure switch banjo bolt brake light switch. The run wires from switch down to headlamp shell. Connect one side of switch to white wire (key on power), the other side to brown that goes into multi plug (power to brake bulb).
I installed one recently on '73 Bonnie that switch had broken & wires cut off. Came out nicely & doesn't look silly at all.
Click this link, scroll to post #28 for photo. This was from eBay. Not costly. It comes with connectors & wire jacket but was too short. I soldered longer wires on & slipped over some wire jacket. Wire jacket was melted to insulation. Carefully cut away. I staggered wire joints to fit into wire jacket smoothly. Be careful with sellers they don't give you metric. Correct thread is more costly. The correct thread is 3/8-24.https://www.triumphrat.net/threads/oil-pressure-switch-woe.977950/page-2#post-2004146038
Here's the switch I used & place I got it from. Canada, shop around for good price. https://www.ebay.com/itm/Brake-Ligh...3-8-24-/183568377385?hash=item2abd872629
If you PM me your email I have photos of most all this stuff.