We no longer carry Dell OptiPlex Micro - system mounting bracket (5493591), but we found this replacement for you.
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The Dell Dual VESA Mount with Adapter is designed to mount your Thin Client to the back of a Dell monitor. This Monitor Mounting Kit is compatible with the Dell Optiplex 3000 Thin Client, Optiplex 5000 and Optiplex 7000 series desktop computers.