I'd go to a shop and try it out. Remember the crampon should friction fit the boot without the straps and shouldn't shake off with some pretty vigourous shaking.
I thought Grivel have a kind of marriage with Scarpa but I'm sure CMs would fit too.
If you get them mail order that HAVE to take them back even if they are in the sale, if they're cheap enough it'll possibly be worth the potential extra postage.
Si C has issues with CM crampons though, something about the strap ant the heel clip.
This is what I am after. The user-reviews are all very positive, but I wanna know more before I part with my hard-earned, particularly as both the reviews don't mention what boots they were used with either.
(Or am I being negative here? Sorry I won't start all that in this thread too.)
My first instinct would be to call Needlesports in Keswick (they do mail order, free postage, if you're not nearby).
It doesn't look from the webpage like they stock the bars you want, but they're pretty good for carrying or getting hold of spares, and as they do stock some Charlet crampons and spares it would seem likely that they can deal with the UK distributor to source what you want.
Otherwise, aren't Charlet part of Petzl now, in which case the UK importer is Lyon Equipment so perhaps a quick email to them asking who stocks the bars or how else to acquire them...
