All the molds that I use are "Do-It Molds" that can be purchased at any reputable tackle dealer. Barlow's Tackle Shop and Grizzly Jig Company carry pretty much the entire line of these molds.
My experience with these molds is that they will usually accept a hook one size bigger or smaller than what they recommend. In some cases, I have also taken a Dremel tool and cut a small relief area where a larger hook will fit in the mold.