1965 AC Bypass Switch

I re-read the passages from the 1966 manual and I realize now that they are consistent with one-another.

BY-PASS Switch
The by-pass switch increases the blower speed
when the “Max A/C” or “Fresh Cool” button is pushed.
​

By-Pass Switch Adjustment
With vacuum applied to the rod side of the inlet
door actuator, the blower motor resistor by-pass
switch must be adjusted so that the vacuum actuator
shaft will engage the switch lever, with .020 to .060
inch clearance between the inlet door tang and the
switch base, moving the switch lever to the closed (on)
position with vacuum applied to the top of the
actuator.​

So at least in 1966, the bypass switch closes and the fan speed is increased any time the AC is on, Max or regular.

But the question remains, where did I get this heater box with a second bypass switch triggered by the fresh air and recirculate doors? Was the bypass switch moved between 1965 and 1966?