GPU rework nozzle size

I got my first BGA rework station. It is a older machine. OKi / Metcal APR-5000. They still sell nozzles and parts for the machine. It did not come with any accessories or nozzles so I need to purchase some to get started. I also need to purchase thermal-couple probes.

The GPU package is 25mm x 25mm. I was wondering what size nozzle I get for that. Do you get a nozzle slightly larger or does it really matter?

I am also interested in a recommended profile for 2011 macbook boards GPU rework.
 
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