The bracket is different from 67/68 to 69. I'm 99% sure you can just change the pedals without changing the bracket. I just did a brake swap on a 68, and I removed the manual pedals for an auto pedal. Just remove the clip & slide pin out. The manual pedals go in from the left side, so you may need to make a little room on that side of the bracket depending on how things are routed under your dash.
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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