Middle catalytic converter for Ford and Marquis From 2003 to 2011 Categories it fits: 1. Mercury Grand Marquis - GS Category (Touring / Mid-Option) - LS Category (Full Option Standard with single exhaust from the factory) 2. Ford Crown Victoria - Standard / Base Category (Touring - The two categories designated for daily use or taxi) - LX Category (Mid-Option and Full Option Standard with single exhaust)