That's a late 68 mirror, according to the part number on the box. The 69 FIrebird remote looks like this (pics courtesy of Vikki):
Here's a pic of the 69 GTO mirror I have. Notice the top of the base where the screw is looks slightly different. As well, the control knob is a different shape (the GTO knob is more cone-shaped) and the bezel (mine is like this) is elliptical like the one pictured in the last pic.
Mark
68 Firebird 350 auto (sold) 70 Trans Am RAIII 400 4-speed (sold) 2011 Challenger SRT8 IE392 6-speed (sold) 2017 Challenger Hellcat 1966 Dodge Coronet 440