I haven't seen anyone that sells two diameters of hoses in one pack.

I've had cloth defroster hoses from Jim Carter, The Truck Shop, and Chevs of the 40's. They are all pretty much the same, just different ID ... 1-3/4" and 2". The reason that I had so many is that I bought the wrong diameter. I don't have the hoses clamped or taped to the outlets and vents. They are holding OK.

My truck had plastic hoses on it when I bought it. They were held in place with duct tape, so I don't know if they slipped off easily, or if the tape was there for insurance.

On my '54 Fresh Air heater, both legs of the "Y" outlet on the heater case are 1-3/4" OD. The passenger defroster vent is 1-3/4" OD. But the drivers defroster vent is 2" OD. I have a rubber collar for one leg of the 1-3/4" OD Y vent so that I can slip a 2" ID hose over it to supply the 2" OD driver vent.

Otherwise, a 1-3/4" ID hose will fit INSIDE the 2" OD drivers vent and hold pretty well.

The '51 and '54 Accessories Installation Manuals show the rubber collars on various ends of the hose. Be sure to measure your vents and heater outlets.

(Lotta OD's and ID's in my post!)

- Lonnie
My '54 3104
Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post.
lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt.

OLD STUFF ... houses, furniture, cars, wine ... I love it all