ORIGINAL: Spitfire222
I know these aren't the same screws, but since we're on the subject of servo screws....
If you're interested, considering buying hex head servo screws like these from RTL Fasteners:
http://rtlfasteners.com/RC/d.html
I ordered a 100 piece bag of both 7/16 and 9/16 sizes a few years ago and I still have dozens left. It was one of the best investments I've made in this hobby...now I never have to worry about servo screws!
(Note: I do not work for the company, just thought I'd share a product I was very satisfied with [8D])
I have a bunch of these screws in #2 and #3 in various lengths. The socket head is so much nicer than a phillips and the built in washer is perfect for servos, cowls and all sorts of other stuff. I got mine from Micro Fasteners. Wherever you purchase them, they are a worthwhile investment.
For the servos arm screw, Tower shows them for Futaba servos and Horizon shows them for JR/Spektrum. Servo City shows all sorts of them too. Heck, they may all be the same, I've never really paid attention.