Broonel USB Ethernet, USB Network Adapter,LAN Adapter with Multi USB 3.0 Ports Compatible with The Lenovo ThinkPad X1 Carbon 14" (7th Gen) - Newegg.com
2.5GbE USB A to Ethernet Adapter – NBASE-T NIC – USB 3.0 Type A 2.5 GbE /1 GbE Multi Speed Gigabit Network – USB 3.1 Laptop to RJ45/LAN – Lenovo X1 Carbon,
RJ45 NETWORK Adapter Dongle Cable for Lenovo ThinkPad X1 Carbon Gen 8 Laptop Par | eBay
Genuine New original For Lenovo ThinkPad X1 Carbon Ethernet Extension Cable adapter RJ45 4X90F84315/04X6435|Computer Cables & Connectors| - AliExpress
StarTech 2.5GB USB A To Ethernet Adapter, Nbase-t Nic, USB 3.0 Type-A 2.5 GB /1 GB Multi-Speed Gigabit Network, USB 3.1 Laptop To RJ45/LAN, Lenovo X1 Carbon, EliteBook/ Zbook, Type-A to Gigabit
RJ45 NETWORK Adapter Dongle Cable for Lenovo ThinkPad X1 Carbon Gen 8 Laptop Par | eBay