Hi Mylee,
Sorry to see your having an issue installing those servos, i am not 100% but i believe the H62xx series servo's were originally designed for the Blade X-Pro 550/600/700 Series of helicopters and they are considerably shallow compared to standard servos.
Any standard sized servo with an approx size of 40mmx20mmx37mm (LxWxD) should fit without any issue.
Hope this helps,
Cheers,
Ross