I don't know that they sold very many in the years they were offered but I think it has more to do with exposure than desirability. If you've ever sat in a glass roof car you'll know what I'm talking about. I just sold my glass-roof '14 GT500 last week and can't wait for the day I pick up Ford's next GT500, ideally I'd like it to have the glass roof.
Any chance they bring the glass roof back?
Any chance they bring the glass roof back?