You'll find that if you rotate the elevator servo so the output shaft is to the rear, and install the rudder servo with the output shaft to the front, the linkage will not be a problem if the rudder arm is fitted to te low side. Use a standard 4-40 ball link and clevis unit on the rudder tiller. Use either Tom's type or a Nelson/Rocket City. Doesn't help the Pro Link on the elevator but what can I say...