This is a revision to the previous SB that we have all seen. They have extended the credit dates and supplied a new Continued Airworthiness Document that must be in your POH
https://support.cessna.com/custsupt/...df?as_id=44302
NOTE: Compliance with Revision 6 is not required if in compliance with the Original Issue or a previous revision. However, if you have not already done so, you must remove and destroy the Instructions for Continued Airworthiness Attachment that is stored in the Technical Library CD-ROM or Maintenance Manual for your airplane and replace it with the Instructions for Continued Airworthiness Revision A that is attached to this service bulletin.
Applicable Service Kit parts credit will be provided per airplane to install Service Kit SK337-75A: Pilot Secondary Seat Stop Installation. When applicable, freight will be credited at the most economical method unless pre-approved by Textron Aviation. To receive credit, the work must be completed and a Warranty Claim submitted by an Authorized Service Facility within 30 calendar days of Service Bulletin compliance before the credit expiration dates shown below.
Domestic . . . . . . . . . . . . . . . . . December 31, 2023
International . . . . . . . . . . . . . . . December 31, 2023