I use to have vending machines in the ASC plant in the City of Industry that built all the Camaro "verts before they closed the Van Nuys assambly plant....
Every car that went throug there T top or otherwise they welded frame connectors on to support the body before they cut the top off....

One thing I never under stood is why all the cars came in complete except for the back glass and or T tops... Then they would take this car all apart cut off the top and put it all back togther

MM64