Great Find! In the original Chrysler Issued Factory Service Manuals, (FSM's), the 57 & 58 Yellow cover FSM's cover 97.776% of important info for 59's. Then Chrysler, back in the day, put out a Red Covered 1959 only Supplement that dealt with the nuances of our 59 Models (M Series). Saved Money not by reprinting the entire catalog when only a few things changed.
In 1960, Chrysler had a sweeping change in Construction, as all models except the Imperials went to Uni-Body design, (no frame at all) So then they did a major re-write of the service manual with these changes.The 59 Model year was a transition year for Chrysler.
Looks like someone took it a step further recently and incorporated the 59 Model year into the 57-58 service manual. I am sure it has it all in there service and body wise,whoever did print it. We have all of the particular Original Service Manuals here on the Forum. Here is the link to it for your any future use by you or anyone else. original manuals are available on E bay all the time.
Here is the link that Ron Keij posted for all to enjoy, it has the Yellow 57 & 58 main FSM and the 59 Only Red confer Supplement.
