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After looking at the 993 parts katalog(page 242), the splitters will not fit the top bumper style below. This kit replaces the part(s) circled in blue. Hope that helps.
I think the blue circled parts are just the stock under corners, not splitters really. The size of the two outer holes on the turbo bumper look very close to the single opening of the NB? My corners are scratched up from the previous owner and it might just be easier to buy the right splitter and cover them up?