Part Q1999A is compatible in the following Models:

HPE StorageWorks AIT 100 Tape Drive

StorageWorks 100/200GB External AIT-3 Drive - 249160-001
StorageWorks 100/200GB External AIT-3 Drive - 249160-B31
StorageWorks 100/200GB Hot-plug AIT-3 Drive - 249161-B21
StorageWorks 100/200GB Internal AIT-3 Drive - 249189-B21