Question about locking lug nuts

Hi all, want to purchase a set of locking lug nuts for my 2001 Taurus. Was wondering if anyone knew the size that I would need?

Thanks in advance,

Did you try looking them up by application on Autozone's or Advance Auto Part's website? I just quickly checked the service manual and didn't see a specification for them. I'm sure it's in there somewhere, but didn't find it where I thought I would.

-Rod