The SG Registry is a great data gathering tool. Of the cars listed on the Z-28 data page the first of the early LOS cars are clearly Add on spoiler cars as the build date predates the COPO production timeframe. In the NOR section the two late April Norwood VIN#s are also likely add on spoiler cars as well due to the production hold up with end cap supplier AO-Smith corporation on quality issues with fit and alignment.
Mine is not on the Registry there.
Phil
