Rather than search for replacement seats, we acquired temperfoam back-support hinged cushions to place on top of the stock seats. We used them in our 2018 and 2009 cabrios, and now have them ion our 2017 452 ICE cabrio. In addition to cushion comfort, these allow more effective reclining, which was my main complaint with the 451 seats, as well as the 453's. We obtained theses at the "Relax-the-Back" store.