Alliance Trumpet Mouthpiece Comparison Chart

These are the model numbers, inside diameters and rough equivalent sizes for Alliance trumpet mouthpieces:

Alliance 1 - 17.50mm - Warburton 1XD
Alliance 2 - 17.25mm - Warburton 2C
Alliance 3 - 17.00mm - Bach 1C
Alliance 4 - 17.00mm - Bach 1X
Alliance 5 - 16.75mm - Wick 3
Alliance 6 - 16.50mm - Bach 2B
Alliance 7 - 16.50mm - Bach 2C
Alliance 8 - 16.25mm - Bach Mount Vernon 7C

I have not tried any of these, but this information does not seem to currently be on their web site so I am putting it here in case anybody is looking for it.

It does not seem like their cornet and trumpet rims match up exactly.