Grind to fit pads from the "major players" are available in lengths from 1/4" on up. I personally prefer the Pachmayr's, though only because I've been installing them since 1973, and that's what I know.
Limbsaver makes pre-fit pads for a variety of the more popular makes/models, but I don't know off the top of my head if they make one for the Handi. Maybe something would cross, but I haven't seen a reference that would say, other than on the packaging.