What I meant was that convertibles have crossbraces that cross from one side of the frame to the other on the underside of the car to make up for structural rigidity that is lost when you don't have a full steel roof. Your t-top car may have them as well, where a hard top would not.Chuggernaught said:I have a t-top, and all the crap is torn off the ceiling on the inside and the only reinforcing done is with bends the sheet steel.
Have you looked under a 1977 Thunderbird convertible? That would be interesting.