Lou's right, of course!

I would add that Piggott's books are generally good resources, as are most books on Triumphs. But the vast majority of those books feature images and information relative to home market cars. Although changes between home- and US-market cars weren't as significant on the sidescreen cars as they were on most later models, it still can be an issue if you
really want to be correct! Little things, like the fact that sidescreen cars built for the US would've had sealed-beam, US-sourced headlamps (NOT Lucas sealed beams until about 1964, btw). Stuff like that....