I'm not sure of the time period of the change, but frame Ids were on the left quarter frame behind the wheel opening this
changed in the late 70's or early 80's to the rear frame bar under the trunk or behind the tag opening a little to the left.
1978 and 79 appear to use the same frame. It possibly has the #459070 stamped along with the manufactures Id and time code.
Hope this helps and my appoligy for not having more info.
David
David Walker, BCA #30832
"GS By The Numbers" Cast, Stamped, Part No., 1970 Field Manual $45.00
"GS By The Numbers" Cast, Stamped, Part No., 1971 Field Manual $45.00
"GS By The Numbers" Cast, Stamped, Part No., 1972 Field Manual $45.00
"V.I.N.-Trim-Paint" By The Numbers, Buick V.I.N., Body and Interior Color Codes 1950-1975 $45.00
Atlanta Buick Specialties,LLC.
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