I go into a buddies shop and see a nice Duster. Or so I thought

Rainy Day Auto said

73 was the ONLY year the OSAC valve was mounted on the firewall. View attachment 1714987701

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Rainy, I have to disagree with you on this one. My 71 Scamp had it mounted in the same location from the factory. Not to mention I have seen other 71's with the valve as well. Now unless your talking just strictly Dusters.