1) yes they are the same.Im putting them on rear axle next week, but they seem to have good reviews on this site.

2) I am in your same boat with the rear rotors, and I am not replacing them, just the front ones which have a groove that I can feel. You will find mixed opinions on this though, I have done it on other bmw's with great success, if you catch it before your pads are ruining your rotors. Bmw rotors are known for being "soft"

3)As for the stainless brake lines, that is a personal choice, I have them on my 330ci but not on my X.

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2002 4.6is Dinan S2
Titanium Silver/Black Alcantara

DINAN
Stage 4 Engine Software
Automatic Transmission Software
High FlowThrottle Body
Free Flow Exhaust
Cold Air Intake System
High Flow Air Mass Meter
OTHER
CCFL Angel Eyes
Stealth XM Radio in ashtray : FM Mod
Pilot H3 Fog Bulbs
Cleared Headlights: Hi/Lo Beams
Hardwired Radar Detector
IN PROGRESS
Powerstop C/D Rotors: (on backorder)
W/EBC Red Stuff (F)
W/Axxis Deluxe (R)
Dice Ipod: Aux Input for XM
THINKING
SMG II
MK4
Bluetooth