The R558,01 Strap from Manfrotto is included with various monopods, and is sold here as a spare or replacement part.
Compatibility
Compatible with the following monopods: 334B, 434B, 479, 557B, 558B, 559B, 560B, 561B, 561BHDV, 562B, 676B, 679, 679B, 680, 680B, 681, 681B, 682, 682B, 684B, 685B, 694, 694CX, 695, 695CX, 776YB, MM294A3, MM294A4, MM394, and MVM500
UPC: 719821254966