There is a convertible GN featured in the "1991 Buick GS Nationals" vhs cassette tape made by Creative Video Images. In the video, the owner says that it began life as an '82 Regal which when he bought it, was a convertible already. He completely took it apart, restored it, and converted it into an '87 GN convertible, complete with correct GN motor and transmission, interior with custom back seat and custom convertible top inside grey liner, wiring harness, computer, wheels, trunk spoiler, front air dams, etc...You can also see that the car's registered in North Carolina...
There is also another one featured in "Kirban's Guide to 1986 and 1987 BUICK TURBO REGALS" on pages 321-322 with Missouri license plates reading "SHW-DWN" ...
Claude. :smile: