They should be fine, at least from all the research I did recently. What size tires are you putting on them?
I have a 2000 'S' and just put 2006 Boxster 18's on mine with offset 57mm and 43mm. When I was looking for rims/wheels a saw that rear offsets up to 48mm fit (BBS wheel). My manual called for the same as yours (50 and 52).
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