All Freeform seats are interchangeable with any Freeform Base. Maybe you have another rider that needs a different size seat? Freeform seats are hand-built and designed for rider comfort with impact and pressure absorption properties of traditional gels, but are 80 - 90% lighter.
Questions about Seat Size?
Our Italian made seats typically size "higher" than U.S. fabricated saddles. For example, a U.S. English size 17.5 would equate to an 18 inch Freeform seat. However, some Freeform seat sizes increase by even more. Please reach out to us if you have any questions about seat sizing and we're happy to make suggestions based on the saddle you have.