Yeah Racing Servo Mounting Washer (Black) (4)

These are a must have if you are running a car without a servo saver to stop impacts from shifting the servo around and affecting steering trim. I put these on my RR10 bomber and on my DR10. They are a very snug fit and you will need to use flat head countersunk hardware to mount your servo using these.

No dimensions listed so I rolled the dice. They fit Tekin servos perfectly. The best way to center your servo on the mount. Not a super snug fit like previous review so he must have a different brand servo. If you had slop you could put a tiny bit of CA on the shoulder. These press into the Tekin ears perfectly with no slop, but not a hard press fit either. ear is like 0.1mm thicker than washer shoulder which is what you want so that you can tighten it down but not potentially deform/warp/strip if going into plastic. fit like they were made for them. Glad tekin went with a standard dimension on servos unlike some brands like mks. I would guess these would fit most servos fine. I'll be picking up another set now that I know they work so well and cost half of the others.