Go Rhino XRS/SRM 4-CORE Floor Plate Insert Kit (4PC) Model 5950090TGo Rhino XRS SRM 4 CORE Floor Plate Insert Kit (4PC) Model 5950090T The 4 CORE system of extruded aluminum rails on Go Rhino's XRS, CEROS and SRM Series of products includes a wide variety of overlanding and trail accessories. The XRS SRM 4 CORE Floor Plate Insert Kit allows you to mount one 4 CORE equipped product onto another, such as attaching an SRM Basket Rack on top of the XRS Xtreme Rack. XRS SRM 4 CORE Floor Plate Insert Kit comes with a