I made some measurements – so hopefully what you are looking for. Starting with the petal, I found this picture online to use (didn't feel like drawing a picture freehand).
Diameter Hole Y = 0.725”
Diameter of fastener Z = 0.5”
Inside distance between fastener Y to Z = 2.2”
Total of the three figures (above) = 3.425”
Distance of inside edge of Hole Y to Fastener Z = 2.2”
The Outside distance (3.425”) plus inside distance (2.2”) added together and divided in half is 2.8125”
Outside distance between fastener Y to Z = 3.4”
Hole Y center would be ½ of 0.725” = 0.36”
Fastener Z center would be ½ of 0.5” = 1/4”
This gives a calculated distance between Y and Z to be 2.81”.
Going to overall length.
Distance from top of brake petal to top of fastener Z = 11-5/8” (11.625”)
Distance from top of brake petal to bottom of fastener Z = 11-1/8” (11.125”)
That averages to 11-3/8” (11.375”)
Distance from bottom of brake petal to top of fastener Z = 13-15/16” (13.9375”)
Distance from bottom of brake petal to bottom of fastener Z = 13-7/16” (13.4375”)
That averages to 13-11/16” (13.6875“)
Now the middle of petal would be (11.375” + 13.6875)/2 = 12.53125”. I would round that to 12.53”
Now, you didn't ask for figures for the power brake amplifier linkage – which I marked below:
Point A is stationary.
Point B attaches to brake petal
Point C is brake booster.
Note, the three holes are not in a straight line!
Hole diameter A is 0.368”
Fastener B width is 0.37”
Fastener C width is 0.5”
I didn't figure out the exact distances.
Inner distance between hole A and fastener B = 2.065”
Outer distance between hole A and fastener B = 2.30”
NOTE: it appears I mismeasured one of these distances.
Inner distance between hole A and fastener C = 2.7”
Outer distance between hole A and fastener C = 3.565”
Inner distance between fastener B and fastener C = 1.235”
Outer distance between fastener B and fastener C = 2.115”
BudW