Polaris RZR Parts For Sale Adjustable Seat Base for 900/1000? April 24, 2015 Is there an adjustable seat base that fits both the 900 and the 1000? I have 1000 seats I’m trying to fit into a 900 but want an adjustable base for one. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related