TA2 would be a secondary interior color. I think it's tan.
79 = 1979
05D = 4th week of May
2 = Pontiac
F = Firebird
S = Firebird
87 = Body style
N = Norwood
21665 = Fisher Body Unit Number
62B = 62B Camel Cloth interior
19L 19U L = Black upper and lower laquer paint
A51 = Bucket seats
CC1 = Fisher T-Tops
A31 = Power windows
Y84 = S/E
TA2 = Tan secondary interior color
960450 = Fisher Time Date Code