Not exactly a direct answer, but while poking around I found this and bookmarked it as being potentially useful:

http://www.fatlion.com/sailplanes/servos.html

If you are replacing the servo, don't you have one to measure up? I have two 80111 Cox/Sanwa servos in my bits box - these appear to be mini size or so. I thought they came from a late '80's - early-'90's Cox E-Z Bee or something like that, but not sure anymore. If one of these will get you going I would be more than happy to put it in the mail to you.

MJD