How to add a class to the CountrySelector (K11)

Hi, I want to add a class to the country selector like this:@select@ @option value=@5678@ class=@{%CountryTwoLetterCode%}@@Canada@/option@ @option value=@1234@ class=@{%CountryTwoLetterCode%}@@USA@/option@ ...more countries... @/select@ But I cannot for the life of me figure out where to do this. It doesn't need to be a class, it could also be a data- tag. I basically need to display the two-letter code somewhere so I can pass it to an address look-up API.Thank you,Deb A.