no problem I was looking at post #14 for the bolt...which says what is says. Use a bolt if you can with some anti seize. Self-taping screws are one time in and not serviceable. They also loose their tightness in a moving vehicle going over bumps.
I meant to say, the link was to a 7/16 bolt, not the 7/32 that I needed. Mea culpa.
That's a good point about self-tapping screws; even if I could get a 7/32 one, I don't think that's a solution. I'm going to try tapping 1/4-20 from the inside - again - before I give up and drill/tap from the cargo side of the tailgate.