Heater controls on 68 rally dash

Sorry Steve but wrong again. Pic of inst' housing above is 67 model. That left bolt stashed in between fan switch and sliders or buttons was one year only.
68 up had both bolts outboard of controller and a touch higher above its center line. Either or, remove the glove box liner to access. Remove knobs from sliders, center sliders, guide them through the bezel from behind. 3/8 socket with magnetic or sticky something to hold the bolt in it. Short extension and 1/4 drive disc type finger ratchet.