Are there two different brake pedal brackets?

[shark1]

I am doing a 1971 K20 4X4 Restoration and I converted it from an automatic to a 4 speed. And I just went through this. After getting the extra pedal and parts I took apart the single pedal I reassembled it with both pedals they bolted right up to my bracket which then bolted right into truck UNTIL!! I went to hook up clutch pedal spring I found that the bracket that from automatic is smaller at top and gives nowhere to attach the spring. So yes they are different.