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It just depends on if you want a Machined Finish which is the PK6, or if you want the Black Machined Finish which is the PKR.
According to the info on both, they seem to be the same with offsets and what not. They should honestly have the same size lips
It mainly depends on what color your car is. You can look around and find pics of people who have the PK6's, but I think the PKR is pretty hot looking.