The Diecast Zone · Model Car Club Since 1994
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(Pics) Randy, I think the 1969 Pontiac would have have a good-looking convertible, as would the '72 Torino GT and the '70 Monte Carlo. Here's a couple of digital mods to my 1/18th GP.

Mike, Excellent choice. I like it, I want one in 1:43 scale already lol !
I had a friend in Florida.....
That had a custom convertible conversion done on a Mark V. It looked fantastic with the top down.
Two come quickly to mind. First is the Continental Mark II of 1956-57, which was made into a very few convertibles on an experimental basis by Ford. Both Brooklin and Legendary Motors made very limited numbers of this experimental convertible in 1:43. I have neither.
The second that I would have love to have seen as a convertible is the second series Kaiser, 1951-55. Kaiser produced a 2-door sedan but never a pillarless 2 door hardtop, much less a convertible. Brooklin's 4 door '53 and '54 Kaiser sedans are two of my favorites.
How about a Continental Mark III?