They fit just fine (shrug)
I have the sedan (MSP) front end. The headlamps would be aluminum or metal coat bezel. Everything lines up fine, no gaps etc.
The hoods are interchangeable, the fenders will work as long as you use the MSP/MP3 iirc. You can use a sedan bumper on the P5 with no issue (bumper support) but I dont think you can put a P5 bumper on a sedan (the sedan support is shorter I think)
The headlamps work just fine, if you dont get a sedan wiring harness you dont have high beams. Havent had high beams for 3 years. I just run an HID kit (you can always go bi xenon if you want high beams)