Here is some facts regarding the A/C in Ford automobiles. The 1955-1957 Ford Selectaire could be factory installed OR dealer installed. There was a kit to install the Selectaire in the early passenger cars. The Polar Air was always dealer installed, and to the best of my knowledge, there was no kit to add it to the Thunderbird. In 1958 and later Ford vehicles through 1964, the Selectaire for the Ford passenger car used an under dash register that looked like an add on air unit. This was not true of the Thunderbird vehicles from 1958 forward which had an integrated A/C in the dash for those years. In 1965, the
