Factory Pipe Headpipe Oversized Water Screw Set Size

Does anyone know what thread size and pitch the oversized factory pipe headpipe water screws are? Perhaps different venders have different setups. Let me know what you have. The originals are 10-32, but I need to close one off quickly while I get an oversized set. So I thought I would block it off with a screw the same size as the oversized set in the meantime.

If the different kits kept with inch, I would assume it would be 1/4-28 for the fine pitch compared to 1/4-20. But if anyone knows please let me know. I thought I would post on here to attempt to get a quicker reply. Thanks!
 
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