I think these are the servos you're looking for... here you go, Good luck with it.
https://www.ebay.com/i/292327220018?chn=ps
https://www.hobbyzone.com/spektrum/a...oaAjcnEALw_wcB
https://superstitionhobbies.com/products/9-gram-servo?utm_medium=cpc&utm_source=googlepla&variant=776934916115&gclid=Cj0KCQiAnuDTBRDUARIsAL41eDpnlJ8sUJAoNAr-UeTNN10mRlCNlkUMBAzNmFUfQ5egy6BmQtGkmuUaAkzMEALw_w cB
It looks like they call for a reversed servo for the plane actually... hence the "R" at the end of the model number(SPMSA330R). I don't know why you couldn't use a standard rotation servo and just go into the transmitter and reverse it though...
Don't hold me to that please.. but I know the BNF series of planes are technically just that... and set up so all you have to do is bind-n-fly.. with no reversing or servo/linkage or any settings necessary...straight out of the box... and that's why I'm thinking EFlite put a reverse servo in, so that an end user wouldn't have to reverse it at the tranny. A standard rotation servo should work by just reversing it in the tranny. I'm sure if you got another servo you'd know right off the bat... but as usual with any servo, double check rotation once it's in the plane. Good luck with it.