Man those are some big labels that we're talking about 10ml vials. You better make sure you're using Wheaton headspace vials as tgey are the tallest or equivalent to the tallest 10ml vials Out there. If you go with a RLS shorty vials from MLS you might have to cut that height in half. Personally I think 45mm x 20mm is perfect. Any bigger than that, and you'll have no room for error while putting them on the vial.
Don't take this the wrong way. I'm not saying my way is the right way or that I know everything at all. I'm just trying to help