As far as I know, if a PX isn't a jib, then it has the plastic riser plate. You can remove it and mount them flat, but you'll have to either get shorter screws or grind them down. For about $20 more, you can get the PX15 Jib (race toe) and put the wide brake on; if you're really cheap you can just bend the crap out of the brake.
This is a more aggressive binding than the PX 12, but it does not have any lifters, and it has a beefier heel and toe piece.
Hope this helps.