I do have ONE t-top storage bag, but I'm not sure if it's for a GN or a 'Vette. It definitely is a genuine GM part as it has a "GM" logo stamped on it. It measures approximately 33"x18" with the flap closed and has a velcro strip on the back side...Is there a way to know for sure for which car it is?...or maybe is there someone here who knows the GN's t-top bag correct size? I'd let it go for $10 + shipping...