NO DMV is going to care about ANYTHING in the VIN number except for the actual serial number digits at the end of the VIN. They JUST look at the VIN to make sure it matches up with the paperwork
No VIN clerk is going to go to some VIN decoder someplace to figure out that, "Hey, this should be a coupe and it's a vert."
Same deal with Fords where the VIN contains a letter code for the engine in the car. If the DMV clerks around the US were running VIN decoders for all those old classic Fords out there - hobbyists would be in a world of hurt. NO DMV clerk is going to look at a Ford VIN and then go out and refuse to title the car because the VIN say there should be a straight 6 in the car and there is a 351 Cleveland in there now.
As long as the Title says it's a convertible and that matches the car - you are golden.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI