Do all 1966 mustangs have locking glove boxes?

Not all 66 Mustangs had a locking glove box; some came with a standard glove box latch and others with the locking latch.

C5ZZ-6506072-B : 65 Glove Box Latch Pony (66 All)

C5ZZ-6506072-BL : 65 Glove Box Lock Pony (66 All)

Source : http://www.aapd.net