That quote is for fitting swivels to the existing seats.
Aftermarket swivels usually mean a height raise as well, so check one if you can. On mine it meant I have to sit closer to keep full leg travel for clutch. Citroen Relay for reference.
@paininthe started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
That quote is for fitting swivels to the existing seats.