As I mentioned elsewhere here, I think this is an important function of the ITAC's initial listing of any car, determining its spec line - or lines. It's an important consideration that once a spec line is established, we are granted freedom to up- and back-date (and cross-date?) among any years, trim levels, etc. that appear on it. The ITAC's listings need to made with that outcome in mind.
Some of the real issues have been chased our (e.g., the '92-95 Civic variants in A) but i suspect there are some oddities still to be addressed.
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