Sidi Ergo 2 Carbon heel replacement

Not sure how it has happened but I have lost one of the heels off my Sidi Ergo 2 carbon road shoes.
Looking on the websites there are two types of heel available; I suspect that I should be going for the M3 type since it is a full carbon sole but the blub isn't very clear and the Sidi website is very poor on replacement heel info and Ergo 2 shoes don't rate a mention. Other websites are also not exactly clear if you are unsure what heel type you want.
Any advice on what heel type I should be ordering for the Ergo 2 carbons?
Cheers
Looking on the websites there are two types of heel available; I suspect that I should be going for the M3 type since it is a full carbon sole but the blub isn't very clear and the Sidi website is very poor on replacement heel info and Ergo 2 shoes don't rate a mention. Other websites are also not exactly clear if you are unsure what heel type you want.
Any advice on what heel type I should be ordering for the Ergo 2 carbons?
Cheers
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