... . new with spare packing . in stock xSeries 3.5" tray, caddy or bracket for xSeries SAS/SATA harddisks. Part numbers: 42R4131, 42R4129 ... 42R4127. Supported by servers with 3.5-inch drive enclosures: xSeries 3250, 306m, 3400, 3455, 3500, 3550, 3600, 3650, 3655, 3700 ... System DS3200, DS3300, DS3400, RD100 and RD200 and others 42R4131 xSeries 3.5" Hot-Plug Tray