Found this a couple days ago at JoAnn's for $8. It's quite close for the inner front (narrow) belt buck for the Jedi belt. It is Dritz 185-33. That's a 1/2 inch leather strip inserted into the second buckle.
This is my tutorial for the kind of belt that will fasten with this front buckle. It is purported to be how the actual Ep 1 (II & III) belts were made: