Screw Spacing for Slicks

Can anyone tell me how far apart the screws are spaced on 15" wheels? I know you can buy a guide or something but I was hoping someone might know.
NHRA Stock class cars don't run screws anymore. I don't run them, and my friends cars don't run them either. We're running 9" slicks, turning 11s with no issues. I have marked the wheel/tire with shoe polish and they haven't budged.
Chuck.