On the question for the 84 GN its easy to tell if it is indeed a 84 GN and not a T-Type. The model is indeed a GK47. All 84-86 Turbo Regals are. Your VIN will read 1G4AK479?H?????? There might even be the letter P in place of the letter H. On both the cowl tag and the SPID label you should find the code 60H. That is the seat and door trim code that only an 84 GN can have. If it was a T-Type with the AQ9 Lier-Seigler seats and the same sand gray color the code would be 60C.All 84-86 GNs and T-Types will have the code W11 on the cowl tag but only the GN will have both a W11 and WE2 code on the SPID label.Remember the GN was an option on the T-Type. This is why both codes will be there. Reguardless of the year every GN has a specific set of interior trim codes. As long as you have a SPID label or cowl tag its easy to check.