Amazon.com: Satechi Aluminum Type-C Clamp Hub Pro with USB-C Data Port, USB-A 3.0 Data, Micro/SD Card Reader - Compatible with 2020/2019/2017 iMac & iMac Pro, Does Not Fit 2021 iMac (Silver) :
Take a tour of iMac Pro - Apple Support
HyperDrive iMac Hub review: More ports on the front of the 24-inch iMac | AppleInsider
How to fix a Mac USB port that isn't working | Macworld
Add USB-C ports to an old 2014 iMac - Ask Different
SABRENT Multi-Port iMac Hub with Front Access USB Ports, SD/Micro SD Card Reader, 3.5mm Headphone Jack and Rear HDMI 2.0 Output (iMac 2017 to 2020) (HB-SIMC) : Everything Else
Satechi unveils new USB-C Clamp Hub that adds 5 ports to the front of your M1 iMac - 9to5Mac
Sabrent 4-Port USB 3.1 Gen 1 Hub with HDMI Port for iMac HB-SIMC
Take a tour: 21.5-inch iMac and 27-inch iMac - Apple Support
Amazon.com: SABRENT 4-Port USB 3.0 Hub for iMac Slim Uni-Body (HB-IMCU) : Everything Else
Thank you, Apple, for keeping USB-A on the Mac Studio - The Verge
Take a tour: 24-inch iMac - Apple Support
24-inch iMac Ports: 4 USB-C Ports and 1 Headphone Jack, That's All
Qwiizlab iMac USB C Hub, 7-in-1 Adapter with 4K 60Hz HDMI, USB-C 10Gbps, USB-A 5Gbps, SD/Micro Card Readers UHS-I, ONLY for 2021 iMac 24-inch : Electronics
4-Port USB 3.0 Hub For iMac - Sabrent
Fastest Thunderbolt 3 External Storage for iMac Pro: EveryMac.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) : Electronics
Up close with the new iMac Pro in all its space gray glory