I started a website that has some info on my Buicks. More importantly I have about 12 years worth of Buick Color and Trim Books as well as Features & Facts books. I have scanned about half of the books and uploaded them to my website. I will post updates here as I add more scans. Thew website can be found here:
If you are looking for info on whether your Buick convertible came with fabric upholstery when it was new (sorry, it didn't) or trying to figure out the difference between Burnished Saddle and Saddle interior colors, these books are a great reference. The books also have info on standard and optional features on the cars as well as vinyl top and paint options for each year. Did you know there was a Police upholstery option in 1964? There are also "Pink Sheets" in a few of the books that showed running changes throughout the model year. The features and Facts books have detailed technical info on each model and competitive comparisons for some years.
The Color and Trim books and Features & Facts books can be found here:
These books are quite large and each page has to be scanned by hand on a large format scanner. in 1966 and 1967 the paint sections had plastic transparencies for each model that could be overlaid onto the paint samples so you could see what that model looked like in your chosen color. I have scanned a variety of color/model combinations for those years. This all takes a lot of time, I will upload more scans as I have time. I have all of the books listed, I have only scanned and uploaded the ones with active links on the Buick Sales Literature web page.