Originally Posted by wahoonc
New unit should mount in the same hole, using the same wiring and drain tube. IIRC the new units are the Dometic Penguin.
67's did not have a 14 x 14 hole.
Also the drain line was installed after production, and at the time the AC was installed.
Drain lines were not a standard "built in" until the 69 model trailers.
Also the 14" x 14" hole was not cut until the 1970 models.
The old TAC-110 models had a small hole for the fan shaft and an oval hole about 2 x 4 inches for the wiring and the 2 refrigerant lines.
Confusing I know, but that's the way Airstream did it.