Since this site doesn't list manuals for a 350C here is the john Deere sites info.
Parts manuals are on line at https://jdparts.deere.com/servlet/com.deere.u90.jdparts.view.publicservlets.HomeUnsigned?selectedMenu=JDPARTS_HOME&userAction=countrySelected&country=US&language=19
There is an Introduction section there for the 350C. I suggest you review that and your serial number to be sure it matches the format.
To get the OEM manuals got to: https://www.johndeeretechinfo.com/
It takes a bit of learning to get the right manuals but you will find them or you can call the 800 number on that page. Have your full serial number available to verify the books you chose.
The John Deere site will give you the right publication numbers for your machine which you can use to shop other places as the publications need to match your machine. Beware of poor quality reprints some are selling.