This product is either discontinued or we cannot get that from suppliers.
Hp 3TK77AA Thunderbolt 3.0 Port, Designed For HP EliteDesk 800 G4 (35 Watt, 65 Watt), 800 G5, O/S Windows 8 / 10.
Maximize the life of your PC as your business needs change with the flexible connectivity of the HP Thunderbolt 3.0 Port Flex IO, which supports ultra-fast file backup, editing, and sharing with transfer speeds up to 40 Gbps.