This just got discussed in another thread. I think the resolution was that kit parts ending in A and B have been superseded by by the kit part number ending in C.

SK152-24C "Rudder Stop" kit is $565 direct from Textron/Ce$$na

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SEB01-1R2 - Rudder Stop Modification (Models: 150, A150, A-150, A-A150, F150, FA150 FRA150, 152, A152, F152, FA152) Compliance: M - Date: 09/17/2020
https://support.cessna.com/custsupt/contacts/pubs/ourpdf.pdf?as_id=53266

SEL-27-02R1 - Flight Controls - Detailed Visual Inspection of Rudder Horn for Corrosion (Models:150, A150, A-150, A-A150, F150, FA150 FRA150, 152, A152, F152, FA152) Compliance: M - Date: 10/07/2020
https://support.cessna.com/custsupt/contacts/pubs/ourpdf.pdf?as_id=53268

SK152-24C - Rudder Stop Modification - Sheet Metal Bulkhead (Models: 150, A150, A-150, A-A150, F150, FA150 FRA150, 152, A152, F152, FA152) Compliance: M - Date: 09/17/2020
https://support.cessna.com/custsupt/contacts/pubs/ourpdf.pdf?as_id=53278

SK152-25C - Rudder Stop Modification - Forged Bulkhead (Models: 152, A152, F152, FA152) Compliance: M - Date: 09/17/2020
https://support.cessna.com/custsupt/contacts/pubs/ourpdf.pdf?as_id=53269

Graeme J W Smith
www.graemejwsmith.com [graemejwsmith.com]