I can't help you with the classics , but I almost went crazy trying to measure for some randonee bars. Where exactly do you measure? especially if you are measuring bars on another bike which are taped?
Anyway I got them and although I think they are slightly narrower on the tops I have to tell you I really love the flared drops (randos are flared slightly more I think). This is the first time I am comfortable (in 30 years!) riding in the drops- all because of the flair. Good luck with your bars and post to let us know how you like them.