And now there are wiring diagrams for the '64 Special and Skylark
http://www.teambuick.com/reference/years/64/64_wiring_diagrams.html

You will now find harness diagrams for 1967...
http://www.teambuick.com/reference/years/67/67_wiring_diagrams.html

and Color diagrams for 1973...
http://www.teambuick.com/reference/years/73.shtml