I can confirm that the Xpert CI-2401-HV servo fits the floating servo mount. It's almost perfect. I spaced the servo out 3mm from the mount to better line up the link.

This servo is fast and strong. It's a bit noisy right now but hopefully it will quiet down over time. Not liking the plastic horn but very few options exist. I did find two aluminum horns that I ordered to try - NSDRC makes a 20mm and Reefs makes a 26mm which will probably be the one to use.

It would be great if Roche made a mount with 2.5mm holes because the servos mounting tab holes are 2.5mm. I opened them up a bit and the 3mm's fit fine.

CI-2401-HV
Power Supply 6.0V~8.4V
Speed (sec/ 60°) @6.0V: .085sec/60° @7.4V: .069 sec/60° @8.4V: .061 sec/60°
Torque (oz/in) @6.0V: 83.56 oz-in @7.4V: 83.56 oz-in @8.4V: 114.79 oz-in
Dimensions 23.15x29x13 mm
Weight 21g
$92