The interchange books say they only fit 66 or 67. However I'm hoping Fake68 sees this because I almost think he and a friend installed the earlier regulators into a 67 many years ago. The GM parts books in the Hollander interchange both say no.
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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 (now converted to a "factory" 4 speed)
Convertible 1/4 regulators will work in a hardtop with the door panel bulged out a little into the seat bottom. (may need to trim the inner panel a little).
Hardtop 1/4 regulators will NOT work in convertible.. doesn't clear the cylinder retract mechanism (maybe only interferes on manual tops ?? not certain).
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72 Nova SS - Minitubbed 70 Nova SS - #'s L-78 Bench Stick 68 Acadian SS clone - factory air 67 Chevelle rag - SS 427 clone