So the GM number is 3857040. Gates number is 20531, Continental 60608, I thought Dayco would also have one but according to their website they only have a universal hose and you don't want that. You'll have to find someone who sells the Gates or Continental.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
I checked napa and Auto Value and both said they can't get it
I wonder if you had someone at Auto Value not totally familiar with how to get one because I checked with our local Auto Value store and the Winnipeg warehouse has the Gates hose, the 20531 in stock.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars