Not that they are essential but they will certainly be informative, if not helpful. These are the main books that are readily available for the 1960 Buick. The Body Service Manual, Chassis Service Manual, and Product Service Bulletins. I Bought them all from two different sellers on eBay. Lots of these are listed at all times, certainly not rare books. I found sellers that had them at decent Buy-it-Now prices because I was impatient and didn’t want to play the bidding game just to save a couple bux. Grand total was just over $100 after shipping for the trio.