Anyone know size and thread pitch of rear sway bar bracket bolts?

[WH23G3G]

I got a factory rear sway bar for my 73 but they didn't have the bracket to rear frame bolts. I don't want to keep buying bolts to see if they fit. Does anyone have a set that they can get the diameter, length, and thread pitch of? Also, do they need to be some kind of sheet metal bolt? I can't tell but it doesn't look like the pre-drilled holes from the factory were tapped.

[Nacho-RT74]

http://www.dodgecharger.com/forum/index.php/topic,1673.0.html