[Bart]

TriPower, you are NOT allowed to pump your own gas??? Really? Wow.

And I wouldn't hold out having the filler on top as an option. Different filler tubes, different quarter panels, different pieces to support it, having to meet up on the assembly line. This is a (relatively) low cost, high volume car. Remember the last few years of the Trans Am came standard with T-Tops. It was cheaper to add the feature, rather than manage how many of each to build. And it wasn't even a matter of saving on tooling, as the firebird and formula could still be had in a hardtop.