4 spring loaded caster wheels

Need four spring loaded caster wheels of the given specification (or very similar spec) Wheel dia: 125mm Wheel width: 40mm Load capacity at 4km/h : 250kg Load capacity at static: 625kg Bearing type: ball bearing Spring tension: 240kg Inital tension: 30kg Spring travel:21mm Total height:200mm Mounting: top plate Plate size:140 ×110mm Bolt hole dia: 11mm

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