Take a 3" hole saw and make one.I just made a pistol station in my room.For one shelf I took a 3" hole saw and drilled out places spaced out just right to hold 6 or 8 die heads.Will soon get some one to make little covers for the heads I have to help keep them dust free.Just be careful when sanding the hole out smooth,the 3" hole saw is already a little big.You can even add counter top to make it look better.
works really great for me,all I do is turn one out then change and place the unwanted head to its place on the shelf
I'll tyr and put a pic up for ya later