Jim,
Just a couple aluminum plates with two rods pressed in and a drill bushing at the top with an alignment rod at the bottom.

You'd locate using the tangs and drill in about a 1/8" deep on each end of the stock by freehand. Then put the alignment rod in one hole and the drill thru the bushing and into the other starter hole. Drill away until you run into the alignment rod. Remove the jig and finish drilling.