Originally Posted by stumpy

If I'm not mistaken the ends of the defrost tubes are 2 different sizes.


They are. Yearone lists a set but I don't know if they are the right openings. They don't say and the picture is unclear.

When I replaced them in my 65 Cuda I just bought preheater hose that matched the larger of the two sizes and hose clamped it down on the smaller size.