What size is the wedge screw in the 66 steering column collar?

[magicv8]

While the column was out of the car the screw must have dropped out. I reinstalled the column and noticed the play ion the collar - and that the screw was missing. What size screw do I insert?

 

[JohnZ]

As far as I know, only the '63 column housing used a wedge and screw; the '65-'66 housing was attached to the mast jacket tube by a round retainer plate that engages the "tangs" on the end of the mast jacket under the turn signal switch, which is attached common with the turn signal switch screws.