CSX3000 series is the original Cobra...big-block, coil spring.
CSX4000 series are the present day replicas of those made by Shelby Auto.
The term "continuation" relates to the CSX4000 series.
The term "completion" (no longer used) referred to the attempt by SAI to assign unused 3000 series CSX numbers to modern cars. Didn't work out well.
