I need to replace the roof on a 1970 but having a hard time finding one in good shape. Need to replace inner and outer together where the quarters meet and some point on the A-pillars. What are the differences on a 75-to 81 vs 70-74? Is the inner and outer roof the same at the quarter panel- rear window? Is the headliner, visor and dome light the same? Has anybody done this swap? Thanks for info.