They are very brittle. Most of the attachment clips will break off when removing the old one so a used one isn't really an option. Even the new ones are pretty brittle. Several tabs broke off on my brand new one when they took it off to replace the windshield. Like Vas said the they sell a kit with the 2 side pieces if you want to freshen up everything but they aren't necessary.
Dinan CAI &Throttle body, ESS Tuning TS2, Bimmerbrakes gen3 headers, UUC SSK & DSSR. Achilles oil pump, VAC oil pan baffle
M3 Motor mounts, UUC Trans mounts, Modified clutch style LSD 3.15, TMS front subframe reinforcement, Koni Yellow sports,
H&R sport springs, UUC sway bars, BMW Perf. Rotors, UUC SS brake lines, Hawk HPS pads, CSL replica wheels,
Rotora strut bar, FXR HID conversion, M3 Mirror conversion, BSW stage 1 speakers