Cuirassier's helmet

[TacHel]

I found an incredible little museum in the Eastern Townships (near Sherbrooke Quebec), they have a few pickelhaubes and helmets, see the attached picture.

Here’s the prob, I’m trying to help them put the helms back in order. Here’s my quite amateurish assessment, tell me if you agree:

-The cuirassier’s helmet at center has the spike of the helm at left and the wappen of the helm at right.

Is my asessment plausible?

If I'm right, I have cockades and chin straps for all 3, I also have a proper wappen for the cuirassier’s helmet… The prob is, where on Earth can one find a spike top for a cuirassier’s helmet? Am I wrong in my thinking that they differ from the spikes on the leather helmets? IMHO, they look narrower and not quite as curved.

I'm really shooting from the hip here and welcome, actually, eagerly await your input.