Location for oil holes on rocker arms?

It looks like my PRW rocker arms did not come with the oil holes drilled. I have had them long enough that it is too late to send them back. So, it looks like I get to drill them. I'm not sure what size of hole to drill, nor exactly where to place the holes. I did not notice the lack of holes when I assembled everything, but figured out the lack of holes when I primed the engine, and noticed the absence of oil flowing down the rocker.

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