Backcountry Beacon wrote an answer about Petzl Vasak 12-Point Mountaineering Crampon on January 10, 2011
Youre in luck, sort of. The Flexlock version does have the holes where the Leverwires toe and heel bail points attach. No one sells these individually, but you may be able to call Petzl directly and order some. Your crampon frames will still have the front and rear posts where the Flexlock system attaches, but they wont really be in the way. You could always cut them off if it bothers you. My suggestion, however, is to simply buy a pair of Leverwire crampons and hang onto your Flexlock ones. I have three different pairs of crampons that I use for various things, and I still dropped dough on a full-strap model this fall for ski mountaineering and early spring rock routes with steep snow approaches. A full-strap crampon can be used for nearly anything. One day youll reach back into your close and be happy that theyre still there.