D-Link Switch Power Adapter Barrel Size

I had a couple of these, and lost the power adapters. (OK, someone else lost them, but whatever.) As always, the voltage and current matter, and these guys use 5V 1.2A or 2A. Some online vendors sell 3A adapters. The barrel connector dimensions are 5.5mm/2.1mm. That's 5.5mm outer diameter, and 2.1mm inner diameter. The actual OD seems to be closer to 5mm, but I think that's nonstandard.