The full qtrs made after Jan 04 are supposed to be near NOS quality.
Anything made prior to that should be used for tuna cans- major dimensional issues with the trunk area and door jam. Along with the above problems they also did not accept the wheel well trim and the chevrons were not deep enough.
The guys at NPD seem to be the most forthcoming about this issue and will hand pick a pair of the "new" qtrs being made- as to not confuse your order with the pre 04 production units.
I did all this research and then bought a california shell.