So, I am adding a/c to my '52. I want to use the unused control brackets/mounts on the bottom edge of dash for the vent and heater water valve control. My question is what are the original purpose of the various controls and location? I know the heater used a bracket for thermostats on right side of lowest portion of dash (on angle). I see a lot of photos of something to left of steering wheel ( not counting brake release). What was that used for. Many places to add brackets, I just want to know what, where and why.