In 1986 the Grand National was an option on the T-Type. The Grand National became a model to itself in 1987. As it was an option, everything was the same on the GN as the T-Type except for the things included in the option package. From memory, it included special badging, wheels (steel/chrome not aluminum), specific interior (gray/black) bucket seets, blacked out bumpers in place of the chrome and a rear spoiler. There was no mechanical difference. The option was cosmetic only. Of course, as stated above, black/black was the only color for this option. The only way of telling for sure is the "WE" code on the trunk lid. If the trunk sticker is missing or illegible, the things to check for are the paint codes as stated above, the GN interior and rear spoiler as these would be the hardest to change.