In reply to LastBoyScout:
> Obviously, if the boot is "that" narrow, then you're not going to find something that does touch.
This is certainly the case for me. I can pull my boots backwards through the rear posts, and the posts don't touch the boot until I get to the widest part of the toe box. There is no way this would stay on without the heel bail, as someone else suggested, but they are secure with the heel bail.
I've attached a couple of photos, mostly for the OP's reference. These are size 4.5 Nepals with Petzl Vasaks. The bar on the Vasaks is set as short as it will go, and the protruding end of the bar has been cut off - I couldn't make these shorter if I wanted to as the heel and toe plates touch. I've been using this combination for around 5 years now - no sideways movement and I've not lost a crampon. In the second photo, the straps aren't done up, and I'm holding the boot by the cuff.
Post edited at 14:15