I need the two dummy screws that go in the left side of the Marlin 336 receiver. I picked up an older 336 that is factory drill and tapped on the left side. I had to drill out one of the screws as it was frozen in there and the head had been stripped out. Anyone know what size screw this is? it's pretty tiny, I'm guessing it to be like a 5-32X3/16".