I've had one GN and one T-Type -- great cars. So good, in fact, that I'm looking for another one.

Just saw a "Grand National" that's black and blacked out, and looks fine after a frame-off restoration, new engine and trans, etc. However, the owner says he replaced the seats with solid black fabric, so no Turbo6.

What is the VIN difference between an 86GN and an '86 T-Type? Or, how else can I tell?