standard length harness straps for all diono convertible car seats. Please select the correct version based on the manufacture date of your product. Short 33″ (pre May 2018) – Suitable for Olympia, Pacifica, Rainier, Radian convertible seats manufactured prior to May 2018 Standard 38″ (pre May 2018) – Suitable for Olympia, Pacifica, Rainier, Radian convertible seats manufactured prior to May 2018 Standard 38″ (June 2018- December 2019) – Suitable for Radian 3 and Rainier 2 convertible seats manufactured prior between June 2018 and December 2019 Standard 38″ (January 2020 - present) – Suitable for Radian 3 convertible seats manufactured prior from January 2020 to present