Product Details : Dell - 1u 2/4-post Rack Rail Kit For Poweredge R620. General Information : Part No : 53d7m Type : Rail Kit. Compatibility : Poweredge R320 Poweredge R420 Poweredge R620 Powervault Dl4000 Powervault Dx6104 Csn Powervault Dx6104 Scn Powervault Dx6104 Sn