I think we determined that the 00'* came with the filter - no plastic frame though. Here'* a pic of mine when I changed it out. It just slides into the compartment - but I do remember my son saying it was a bugger getting it in... But on mine, I don't remember there being room for a plastic frame...not sure if your 03 is the same or different.
that is EXACTLY what my GM Filter looks like, only cleaner
Location: North of Buffalo, NY *** NEBF '05, '06, '07 *** ***ONBF & NYBF 06; 07*** ***WCBF 06***
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Thank you Mark! So...back to the original question regarding "can I buy a plastic frame and do I need it?" I would have to say no, you don't need it but it'* obviously better otherwise they wouldn't have changed the design and made it an option.