?? What kind of dish do you have???
Since you're talking
actuators and positioners, it sounds like you're talking about a
C-band dish, however most C-band dishes come with a polar mount attached., unless you have a small one that comes with a fixed mount. If your dish didn't come with one, I don't think that you are going to find a C-band polar mount that is compatable with actuators. About the only chance you would have, is if your dish is a relatively light 6' dish, in which case you might be able to adapt it to work with an H180 motor instead of an actuator.
But anyway, you haven't given enough info for a useful reply.