Shimano Dura Ace R9100 Front Derailleur Link Cover
This Shimano link cover is also compatible with the front derailleurs below.
Shimano Ultegra FD-R8000
Shimano 105 FD-R7000
Shimano 105 FD-5801
Shimano GRX FD-RX810
Shimano GRX FD-RX400