There, I Fixed It: Lenovo X1 Carbon 6th Gen Ethernet Port + Thunderbolt Port fit : r/Lenovo
Original New 4x90f84315 For Lenovo Thinkpad X1 X380 L380 P1 Carbon Ethernet Extension Cable Adapter 04x6435 - Computer Cables & Connectors - AliExpress
StarTech.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, HP EliteBook/ ZBook