while not official Triumph items, I have one of these
Union Jacks on my hard bags and I also have
Canadian and
US flags below the plate (on my 97 Tiger).
I find their size is just right for the motorcycle and they're reflective to boot which I think is a nice bonus and worth the US$2/each
Since my new 06 Sprint just arrived off the truck today, I haven't ordered any for that ride as I need to decide just where they should go.