T-tops were added to all years and all model Fieros using the same kit from Cars and Concepts as the factory authorized 1988 CJB coded cars.
In most cases the non-CJB t-tops were installed by C&C authorized shops if not the main C&C facility in Brighton Michigan. They are virtually identical.
Although the factory code carries some mistique among collectors even the aftermarket T-top Fiero is a rarity. It's estimated that only about 2,500 of the "aftermarket" t-tops were installed. Probably less than half of those survive to this day.
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[This message has been edited by jscott1 (edited 05-24-2003).]