Alright, I pulled the trigger -- like a crow, I can't resist shiny bits.
Frustrating they don't list the sizes in every showing of the items so to some extent I'm buying a pig in a poke, and I don't have that kind of money to throw around.
On the UK site, they accept the TT20 discount code, and after you enter your US address, they subtract the VAT, and add the "US premium courier" and the discount is about double the shipping, so the discount works out to be about ten percent with "free" shipping.
Will see. And now I will have one more thing on which I will have to put the mechanic on notice I expect to have back with the bike when he's done.