Threading for rear axle locating screws
 

My newly-acquired Grandis is lacking the locating screws for the rear axle.

Is there any standardization of thread dia/pitch for these things?

Anyone got an extra pair that ought to be right for an early '80s Italian frame?

3mm x .5
you can search out stainless steel long machine screws (smallparts.com, McMaster-Carr, or fastenal) and never have to worry about rust.
Here's some at 30mm length, just $6.45 for 100 (try to find Campys for that price!) add some little SS nuts and you're all set.
http://www.mcmaster.com/#machine-screws/=69gjzg

You can also go this route.

Or:

http://www.velo-orange.com/dradsc.html

Grab some elk hide bar wrap while your at it....

yeah-yeah...those are definitely better prices than Campagnolo offers, but for the price of a PAIR (albeit with little cap nuts and springs) you could buy ONE HUNDRED, and in stainless steel, too!
I'm a sucker for that math...BTW, I have used the springs from ballpoint pens to replace rusted-out original springs...but you can also find SS springs in appropriate sizes from one of my sources, above.