Here are some videos of how to make your owm epoxy impression of your mouthpiece. If you make one I can copy your mouthpiece from that, or copy your rim, or just the rim contour. You keep your mouthpiece and don’t have to part with it.
Say you have a 10-1/2 C that you love the feel of the rim contour, and want that contour on your 14a4a.
Send me an impression of both mouthpieces and I can do it. Usually it’s best to make two just to be safe. It’s possible to mess the impressions up in the chop saw when they are cut in half. (they need to be cut in half or quarters to follow the profile)