[cycleguy55]

The way I see it, there are a number of different distinctions we can / should all agree upon:
a) Original: Cobras sold by Shelby from 1962 to 1967 as complete cars, as documented in the SAAC Registry
b) Continuation: CSX1000, CSX4000, CSX6000, CSX7000 and CSX8000 Cobras (complete, roller or 'turnkey minus') manufactured by Shelby American Inc., Shelby Automobiles, Inc. and associated companies.
c) Replica: Any 'Cobra-like' or 'Cobra-type' car not considered an 'Original' or a 'Continuation' Cobra.
d) Shelby: cars (complete, roller or 'turnkey minus') manufactured by Shelby American Inc., Shelby Automobiles, Inc. and associated companies.

These distinctions or categories are not mutually exclusive, and a Cobra may only fit into one category (e.g. ERA or FFR Cobra would be a 'Replica'), or it may fit into multiple categories (e.g. Real1's CSX4206 is a Shelby Continuation Replica).

There may well be a number of other nuances to deal with, but I hope these are the majority of the classifications. Feel free to clarify or contribute to the above.