I typically just run with Rockauto for the majority of my needs. That being said, sometimes some parts that aren't "compatible" with Marauders are available for other 03+ panthers. I had this issue when looking for OEM sway bar endlinks and I had to pull up a 2006+ Town Car on RA despite the P/N being identical for an 03 Marauder/Marquis.
2003 300B Mercury Marauder
Built 01/22/03
Purchased 01/29/20
68,xxx miles
July 12, 2023 - 68,203 Miles - RIP original engine
October 31, 2023 - Rebuilt engine installed
Modifications/Stuff I have done on the car:
Engine:
rebuilt stock; slightly overbore. Original 68k mile heads, new OEM Ford performance timing kit, Terminator Cobra Oil Pump, Billet Steel oil pump gears, ARP head studs, main cap studs, and side bolts. The latter ARP stuff for future endeavors.
Transmission:
Thor 2800-3000 Stall Converter
Suspension:
ADTR Front + Rear Sway Bars
Metco Billet Watts Link
Metco Billet Rear Control Arms
Cosmetic:
1998-2003 Amber tail lamp conversion - Painted and smoked to near-OEM spec.
HID Projector Headlamp Retrofit
OEM Mercury Mountaineer Hitch Cover
Front in-channel rain guards
Other Stuff:
4-pin trailer harness
Class III Tow Hitch
Cadillac 4-note horns
Hayden 679 Transmission Cooler
Obligatory Marty Tune