[T2] Screw size for steering column?

[Nathan]

I'm going to replace my switch as per this Ratwell article.

http://www.ratwell.com/mirror/bclausen/How_to_files/IgnSw/

Wanted to go to Autozone to get everything beforehand as this is my only
vehicle.

Anyone know what size that replacement screw is, about 10 pictures down,
the one you use to replace the "factory tamper proof" original?

Given that my horn has a crack in it, this probably isn't the first time
someone'a done this, but I'd like to be prepared. :)