i have a 2004 rx8 automatic
i wanted to know if the rx8 is off and parked up
and someone hit the passenger side door will the
passenger curtain air bag go off..how does it work?

and will a 2005 rx8 parts fit on a 2004 rx8
such as doors?

also up to what year rx8 parts
can be used on a 2004 rx8

 

No the airbags will not go off, unless there is a passenger in the seat.
Yes all parts prior to '09 should fit. But don't quote me on that as I have a 09.

 

Last I checked the only parts that won't fit are 09/10 parts on 04-08