The American T-Top was an aftermarket T-top that could be installed. They weren't done by the factory, they weren't done by the delaers, they were installed by owners who were sick of the Hurst T-tops leaking. They are about the same as Hurst t-tops, but about an inch deaper. I would say it neither hurts nor increases the value of the car. It hurts it a little more because they are aftermarket.