Dell - Hard drive rails 87VYR Dell Hard Drive Rail, P/N: 21TUG or 87VYR. 1 pair.Compatible with the following models: Dimension 2400C, Dimension 4200, Dimension 4300, Dimension 4500, Dimension 4500S, Dimension 4550, Dimension 4600C, Dimension 4700C, Dimension 8250, Dimension 8300, Dimension 8400, Dimension XPS, Dimension XPS 600 Dimension XPS G2, Dimension XPS G3, OptiPlex GX150, Optiplex GX150 SD, Optiplex GX150 Small Form Factor, OptiPlex GX240, Optiplex GX240 SD, Optiplex GX240 Small Form Factor, OptiPlex GX260, OptiPlex GX270, Optiplex GX270 SD, OptiPlex GX280 OptiPlex GX50 (1.2 Ghz and above), OptiPlex GX50 (R2), OptiPlex GX50 (Under 1.2Ghz), OptiPlex GX60, PowerEdge 400SC, Precision WorkStation 350, Precision WorkStation 360, Precision WorkStation 370, Precision WorkStation 450, Precision WorkStation 470 Precision WorkStation 530, Precision WorkStation 650, Precision WorkStation 670