Can someone please help me,I am interested in selling a nice frame for a 1972 Buick skylark custom 4-door car.Is the same frame used for a 2 door GS as a 4-door skylark??Is a convertible car frame length the same??Basically, I am trying to find out who can use this frame.Is it only the 4-door guys or is it a commonized frame??Any help would be greatly appreciated!Thanks Sincerely Mike!! P.S. The GSX reunion at the 2009 BPG was AWESOME!!!!I heard there was 94 GSX cars there.I saw them all but didn't count them!Glad to be a part of history being made!!!