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Old 08-26-2005, 05:36 PM   #20
Jakes-66-K10
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Join Date: Aug 2004
Location: Idaho
Posts: 640
I don't have a build sheet for my '66 like the 67-72 trucks do. I always figured the seat was installed into mine by the previous owner from a 67 or 68, until I found someone that had a bone stock '66 GMC just like mine. It was ordered from the factory with the higher output 351E and buckets. My guess is they started doing this in late '66, but it is alot more common on 67 and 68 years.
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