Need Help! Third party AC servo amps

I need to purchase some reasonably priced third party servo amps to drive siemens brushless ac servomotors for a fifth axis table.
One motor is 1FK6063-6AF71-1AG0 the other is 1FK6060-6AF71-1AA0.
I have matched quite a few dc servo motors and drives but I am not confident matching the ac drives to these motors in particular the encoder/commutation side.
Any help would be appreciated.

Thanks Bill.