Part JD641A is compatible in the following Models:

HPE MSR Router Flexible Interface Cards (FIC)

HPE MSR 8p Async Serial RJ45 FIC Module - JF260B
HPE MSR 16p Async Serial RJ45 FIC Mod - JF265B

HPE Router Transit Cables

HPE X260 Transit RJ45 0.5m Single Cable - JD641A