That seems odd to me. The Fool Proof has quite a bit of adjustability built in. In fact, I don't know that I've ever needed a different height front when coupled with a Fool Proof receiver sight. I've changed the front to get a different profile (blade style), bead size or to a fiber optic but generally the height has been pretty much the same. When I have needed different height fronts is when using the XS Ghost Ring or Skinner sights that mount on top of the receiver instead of along side like the Fool Proof.

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.