If you have a milling machine you can make a die to form those pieces, very simple, you will need a press for operating the die, if you don't have either one of those machines it will become quite difficult to manufacture those pieces in great quantity.

I have plans listed on home made tools for a hand shear that would be fine for cutting the 1/4" strips, here again if you don't have access to a milling machine your job is going to be difficult considering the amount of pieces your trying to make.

Doug