The clutch pedal is the same all three years. The mounting bracket and the brake pedal are what's different 67-68 and 69. If you have an existing 69 mounting bracket in good shape, they are the same whether the car is manual or automatic. You just slip out the auto brake pedal and slide in the two pedals.
Rick's online catalog ( www.firstgen.com ) should have some good pictures of the bracket and pedals.
If you're swap meet hunting, yes the date is stamped in the top.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!