Advice please for purchasing a new A\C compressor with other parts

Hi All
I have mentioned before that my wife's original A\C compressor failed, as did the replacement 2nd hand unit too.
So, with this in mind we have found a supplier that can provide a new A\C compressor, but need advice as to whether we need to purchase other parts of the A\C system also?

I have heard that the Dryer will need replacing alongside a new compressor, as the old unit may contain contaminants that will reduce the lifespan of the new compressor.

I'm not sure if this is a separate unit or part of the condenser? So, it may mean we will need a new condenser which includes the dryer.

I presume new seals/O-rings come with a new dryer or condenser too?
It won't be cheap, but we need to sort this out once and for all.

Any guidance with the above would be much appreciated.

This is for a 2009 1.3 Copen.