The CCX-ADD Curve Corner Add-On Pool Step by Confer is made for use with the CCX-IG 3 Step Base for in-ground pools and CCX-AG 4 Step Base for above ground pools. The CCX-ADD is a universal Add-On piece to be used in tandem with one of our CCX base steps. With the CCX-ADD Curve Corner Add-On Step connected to the Base step, the complete Curve Step System width is 58". The Curve Add-On Pool Step can only be installed on the right side of the step as you are facing it.