Originally Posted by QKShooter

I just checked all of my Sparks and the Sparks slots are dead on the money at 1.5"

My DelFatti rig slots are about 1/16" over.

JUST FYI - You can always wrap some sandpaper around an appropiate width of wooden dowel rod and lengthen your holster slots a bit by carefully sanding them until they are a bit longer.
Just lengthen your holster slots until your desired belt slips through.

Even a round pen or pencil will work.