My switch has a lock number and the T-160 manual has a big table of correcponding key number codes but I seriously doubt I can now stroll into my local Triumph dealer and order that key for a 1975 bike... or can I?
Never tried it but ... the T160's keys were from the Wilmott-Breeden 'FS' range, also used on contemporary British cars and other vehicles; I can remember going to a locksmith and him reaching down a key off a display board ...
Or a locksmith can cut you a key from the number? Or someone in your car club has had keys supplied by a specialist with a website ...?
I sure would feel stupid buying a $52 ign switch
Bear in mind too that, for all the "Genuine Lucas
" garf being peddled on the www, most if not all new switches available are either Wassell's pattern tat or someone else's pattern tat.
It's possible to open up original switches and clean up the internal contacts, corrosion being the usual reason they stop working. Btw, if you have the T160's switch out, before refitting it, drill a small hole in the brown material of the bottom, at what'll be the lowest point when the switch is refitted; any water getting in the top can then run straight out rather than swilling around in the bottom corroding the contacts. :bigt
Btw2, answering a question you didn't ask, the steering lock is secured in the bottom yoke with a grub screw, covered by a lead plug and paint ...