The HP RM2-1366-000CN Waste Toner Feed Link is a printer internal assembly used in the waste toner feed mechanism. It is the right-side link assembly, identified separately from the left-side counterpart.
Parts documentation lists it for the HP Color LaserJet Enterprise M751 and M856, Color LaserJet Managed E75245 and E85055, and Color LaserJet Enterprise MFP M776 families, including M776dn, M776z and M776zs. It is a specific mechanical printer part for these listed families.