1965-1971 Models 
1st Digit - Division  
4 = Buick  
2nd and 3rd Digits - Series  
33 = Special V6 (1965-67)  
33 = Deluxe L6 (1968-69)  
33 = Skylark L6 (1970-71)  
34 = Special V8 (1965-67)  
34 = Special Deluxe V8 (1968-69)  
34 = GS350 (1968-70)  
34 = GS (1971)  
34 = Skylark V8 (1970-71)  
34 = Sportwagon V8 (1970-71)  
35 = Special Deluxe V6 (1965-67)  
35 = Skylark V6 (1968-69)  
35 = Skylark 350 (1970-71)  
36 = Special Deluxe V8 (1965-67)  
36 = Skylark V8 (1968-69)  
41 = Sportwagon V6 (1965)  
42 = Sportwagon V8 (1965)  
43 = Skylark V6 (1965-67)  
44 = Skylark V8 (1965-67)  
44 = Skylark Custom (1968-71)  
44 = Sportwagon V8 (1967-69)  
46 = Skylark Gran Sport (1964-66)  
46 = GS400 (1967-69)  
46 = GS455 (1970)  
48 = Sportwagon Custom V8 (1967-69)  
4th and 5th Digits - Body Code  
07 = 2 Door Post Coupe  
17 = 2 Door Hardtop Coupe  
27 = 2 Door Post Coupe  
35 = 4 Door Station Wagon  
36 = 4 Door Station Wagon  
37 = 2 Door Hardtop Coupe  
39 = 4 Door Hardtop Sedan  
55 = 4 Door Sportwagon  
56 = 4 Door Sportwagon Custom  
65 = 4 Door Sportwagon  
66 = 4 Door Sportwagon Custom  
67 = 2 Door Convertible  
69 = 4 Door Sedan  
6th Digit - Model Year  
5 = 1965  
6 = 1966  
7 = 1967  
8 = 1968  
9 = 1969  
0 = 1970  
1 = 1971  
7th Digit - Assembly Plant Code  
B = Baltimore, MD  
C = South Gate, CA  
D = Atlanta, GA  
G = Framingham, MA  
H = Flint, MI  
I = Oshawa, Ontario (Canada)  
K = Kansas City, MO  
V = Bloomfield, IL  
X = Kansas City, KS  
Y = Wilmington, DE  
Z = Fremont, CA  
Last 6 Digits - Production Number
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