Hello all. I got a Windsor Clockwork recently and while it's currently meeting my biking needs, the drop bars have to go. I ride 2 miles in the morning, which is doable, but on my 7 mile ride back home it gets uncomfortable and my neck starts to hurt from trying to keep my gaze up. So I've been looking into getting mustache handlebars but I'm not sure about the sizing.

Right now I have seen some handlebars that have a 26mm clamp diameter, which is the current diameter of my drop bars. Surely those fit but I have also seen others that are 25.4mm. It's really gonna come down to price for me so if I find that the 25.4mm are more affordable, what would I need to make them fit on my stem?