The UTV Inc replacement seat bases allow you to install them into your RZR just like stock seats! Our TIG-welded, aluminum, handcrafted seat bases are sold in PAIRs (2 seats worth) and will allow you to mount the SPARCO seat directly to it and into your RZR without any modifications or cutting! These were designed off the Sparco Evo II US seats. If you have any other seat, purchase at your discretion.