I used the basic Futabas on mine (2003s I believe). Bulletproof and relatively inexpensive. I use the larger ones in most stuff unless size is a concern, I go with micro.

If it's a 76 turret, there's little room for anything larger than a micro.

Since we're not talking about crashing or personal injury if the servo fails, there's no need to go too expensive, there are plenty of cheap options from HK and elsewhere. I have piles of knock offs that I've pulled from planes after they've expired. My benchmark is if the installation is a one way trip, I go with a reliable option, if it's easily removed after construction or for something simple like MG movement, anything from the spares drawer will do.