Chrome and black slabs is stock in the US. Full chrome is Euro spec. At least on a base 330i. Might be different for other models.
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The ZHP is different from the base model. MSport is also different, that came with shadowline grills.
Mine came with chrome slats too
https://uploads.tapatalk-cdn.com/202...3231554347.jpg
I'm 95% sure looking at old photos of my car that it too had silver slats with silver surround on the stock grille.
I was just looking at some 2005 brochures. The ZHP sedan shows with black slats and most other models (non ZHP) with silver slats. Same thing in the 2005 convertible brochure
Pretty sure the ZHP came with chrome grilles. Mine came with chrome grilles and that's what you usually see when somebody buys one. But black grilles are a popular mod.