iMac (21.5-inch, Mid 2011) - Technical Specifications | Imac, Apple smart keyboard, Macbook pro sale
HyperDrive 5-in-1 USB-C Hub for iMac 24″ - Walmart.com
USB 3.0 for iMac mid 2011 | MacRumors Forums
Apple iMac 21 Monterey OS 2011 1TB SSD Ext USB DVD Mouse Keyboard CUSTOM UPGRADE | eBay
Amazon.com: Hagibis iMac Hub with 4K@60Hz HDMI, USB C 3.1, USB 3.0 Ports and SD/Micro SD Card Reader, USB-C Clamp Hub USB C Docking Station for 2021 iMac 24 inch (with HDMI) :
Amazon.com: Mini DisplayPort to HDMI Adapter for iMac Mid 2011(27-inch, 21.5 inches) Mini DP to HDMI Adapter Compatible with MacBook Air/Pro, Microsoft Surface Pro/Dock, Projector and More 1-Pack : Electronics
USB 3 + Wifi ac + BT4.2 for iMac 27" mid 2010 | MacRumors Forums