Exhaust Manifolds

They are different. I believe the OEM part numbers are:

Left: 3W3Z-9431-BA
Right: 3W3Z-9430-AA

List of parts (credit to gdmjoe): http://www.gdmjoe.com/marauder/documents/2003grandmarquis-marauderpartslist.pdf

I believe they are discontinued:
https://www.tascaparts.com/?p=catalog&mode=search&search_in=all&search_str=3W3Z-9431-BA

https://www.tascaparts.com/?year=&m...-AA&p=catalog&mode=search&scat=&search_in=all

Many owners have upgraded to headers. This may be an option to consider if you are only considering new parts.
 
no, none are cracked but doing a rebuild in the spring and want to start gathering hard to find parts. Mine are rusty, looks like they came out of the deep sea.
 
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