Screw in valve cover studs 1/4-20

I’m looking for screw in valve cover studs for my 383 engine. I’m putting my engine back together and the flat head screw in valve cover studs make it nice and easy to set valve cover. They were on the car when I got it so I don’t know if these were ever OEM? They are 1/4-20 thread count and 1 1/2 inches long. I need about 6. See pic.

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