This BedSLIDE Classic guardrail for classic 65 Inch and shorter. This 50 Inch upgrade kit get you more containment with GUARDRAILS. Add GUARDRAILS to any BedSLIDE 1000 CLASSIC. GUARDRAILS provide containment to cargo and equipment from falling off the side of the BedSLIDE. With the added T-slot your options for cargo managment keep getting better. Not compatible with 2015 and earlier models.