Hi, your T120 was made approximately in april of 1966. Mine is a 1966 T120 DU399.. delivered to Pride and Clark in London in May of the same year.
All the early UK T120’s omitted the “R” letter. The T120R (road) was destined for the US market and differed mainly with high rise handlebars and a variation of exhaust pipes, depending on east and west coast specifications.
As regards spares, see you’ve had a few replies but can recommend Grin in Scotland, he’s been my main source since I started a rebuild in 2003. 30 odd years in the business, dedicated to Meriden machines, (and some Harris Bonnevilles). You can see his catalogue or reach him at:
[url=http://www.grintriumph.com”>http://www.grintriumph.com or <a href="mailto:email@example.com]firstname.lastname@example.org[/url]
What Grin doesn’t know about Triumph’s isn’t worth knowing.