#2 Looks like the one used for the 69 rocker molding at the front.
#3 Could be used in several places but the size would narrow it down. Hood lip or grill moldings? There is one kind of similar used on the tail light panel.
Honestly, I cannot recall many moldings on a Mach 1. Hood, grill, stone guard, Mach 1 side trim. The MPC did not show anything at quick glance.