I2C Shield for Raspberry Pi 4, Pi 3, & Pi 2 with Outward Facing I2C Port Terminates over HDMI Port - store.ncd.io
Overview of Raspberry Pi 4 model B - Acoptex.Com
Amazon.com: 4-Port Raspberry Pi USB HUB HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W, 4 USB Ports Compatible with USB2.0/1.1 Onboard USB to UART Onboard Multi Indicators : Electronics