This product can be found on page 176 of the Ennis Fabrics 7th Edition Canada Supply Catalogue
SWIVEL ROCKER BASE FOR CUSTOM APPLICATIONS The same sturdy unit as found on the 5 leg rocker base but without the legs. Mounts instead using standard 7 swivel plate as base, again multiple elongated mounting holes will accommodate a wide range of
Swivel Rocker Base W/O Legs-Swivel Rocker Box (without legs). Multiple elongated mounting holes will accommodate a wide range of seat types. Swivels 360 degrees and rocks. Overall height is approximately 3.