Check out the September 1963 press release for the 1964 Buicks. The neat things I see are that front seatbelts are a $10 option, and a 4 door hardtop cost more than a 2 door coupe.

1964 Buick Press Release

1964 Buick Press Release

1964 Buick Press Release

1964 Buick Press Release

Source: eBay