That's what I thought but this conversion looks pretty professional, at least in the pictures.Plymouth never made a 4 door convertible in 57, 58, or 59. It looks like someone put it together using a 4 door hardtop.
I used to own that car. It was a hardtop Belvedere with the top cut off when I bought it. I went to a junkyard and cut the entire windshield header off of a 67 Pontiac Tempest and got the entire working top frame. Then I grafted the windshield header into the 58' so the top would have a proper seal and latch down system. Then I had to narrow the frame and build infrastructure inside to mount it and make it so it would go up and down. I had an upholstery shop make the vinyl top to fit it. The hardtops have huge fully boxed frames and bracing behind the front doors to support the hinges of the rear doors so even after being cut off for 30 years or more it never sagged and the doors all operated normally. I sold it last year to a guy in Newport BeachFrom what I can see of the door gaps, it appears to have proper reinforcements installed. I don't detect any sagging.
Is this factory? I've never seen or heard of one. 1958 Plymouth Grand Voyager
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