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James,
There were 3 factory bumpers for 2003.
1. The Base 2.7l bumper w/o the center rad opening. This one does not apply to your "S".
2. The "S"3.2l bumper w/ the center rad opening.
3. The "Aero kit II" bumper, AKA GT3 bumper. I believe this one was available with a center opening or with a center opening block-off panel.
Then there is the possibility that you have the vent duct inserts for either an earlier Boxster bumper (pre 2003) or for a 996 bumper.
Hope this helps.
Aron
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