Replacing central locking motor with Keyless Entry

Please help! Newbie questions!

Just got an 04 K12 SE with keyless entry, to replace my lovely pristine 03 K12 SE that got rear ended and ended up in a very sorry state.

The passenger-side front door is making the grinding noise that indicates it needs a new actuator.

Three questions:

1. Is it just the actuator that's needed? My mechanic buddy says 'central locking motor'...

2. There is the complete lock unit for that door available on ebay. Is this what I need? There are actuators available, but not for that door.

3. Do I need a particular unit for a keyless entry car, or will one for any K12 do?

(Not at all sure of the relationship between central locking and keyless entry, as you can tell!)

TIA
 
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