Hi Liftmys10, If we could still get the FS 70 MG servos from Robbe it would be a bit easier. Those are about 1mm less wide and 2 mm less high. But sadly enough Robbe had to close the books and the Hitec ones are closest in size for the same torque.
Well nothing a couple of washers and a bit of filing can't take care off.
And filing is the only thing I got around to doing today.
Taking that ridge out should make it possible to get the servo a tad more to the back so there is more than a hair's width of space left when the diff is locked. Bit worried that over time the plastic servo horn will start bending a little under the tension and hit the sides causing more stress on the servo.