It is a good buy. Even though it is the Readers Digest version of the book it still list all of the major parts and it covers all those years in two volumes, but the two volume set is still smaller in volume and by far cheaper than a single edition manual that has every make and model made with the part numbers in it (including your Hudsons and Renaults that you might not be interested in).
That being said if I told you a Hollander number of 1541 was for a rear quarter for a 1964 four door hard top, could you walk in the front door of your local salvage yard and get the chunck of car that you want?
Knowing the Hollander number and finding the part are two different things. But then again armed with the Hollander number you can walk into your local yard and put a request on the "line" (their internet connection) and somewhere in Canada, Mexico, or the continental US and Alaska; if a yard has the part, they will respond saying I got it come and get it for "X" number of dollars (point of fact, you will probably start a bidding war as the "line" is interactive and everyone sees each others transactions and attempts to make a sale. So the best buy for you will float to the top. It just might require you to make a trip to Rancho La Tortuga in the Sonoran desert of Mexico to get the part (or maybe Eagle Village in the Yukon Teritory Canada).
Big Dave