ORIGINAL: 46u
E-Sky from what I know has to different servos. One is analog like what you bought and then they have the EK2-0508 which is digital and you cannot mix them. Other words you have to run either all analog or all digital.
Thanks 46u;
Trying to post some pics of them. The one on the boom is the stock one (same in the cyclic) the other is what i bought. both are ek2-0500 and analog but stock ones are faster servos. As you can see the electronic circuit inside are different but mechanisms are the same