I used the search function but couldn't quite find the answers I'm looking for. I'll soon be getting a stock and action back from Stockade Stocks in Nebraska. They are tapping a hole on the action for a 4.40" screw spacing for added stability. Apparently these PTA's (at least the dual port) come with an additional hole drilled that just has to be tapped to allow for the 4.40" spacing. My questions are:

1.) What sort of screws do I need to mount the action into the stock? (diameter, length, and thread pitch)

2.) Are all three action screws the same length or does the rear screw need to be shorter?

Thanks!