Try these people
http://www.aircraftspruce.com/catalog/b ... ual337.phpOnly Cessna can provide a replacement Pilots Operating Handbook and Approved Flight Manual. They are also the source for the Supplements that are added under Section 9.
They should also provide a checklist showing list of pages and date of issue.
The supplements WILL NOT cover any mods that were not installed by Cessna.
You used to have to 'prove' to Cessna that you are the owner of the aircraft.
Googling your request will provide the links you need.
I hope this helps.