I can say that I unknowingly ordered the insulation package (termed "additional acoustical insulation", option code BS1) with my 77 TA. It was a $16 option and did not include under hood insulation. When I questioned the dealer at the time, I was told that only came on Firebirds and Formulas, not TA's. My brother bought a Firebird Esprit the same year, it had the under hood insulation.