We have the same issue in Australia under the CASA regs, they don't specify standards for anything after the hook. However there are very clearly defined standards for lifting equipment manufacture, maintenance & inspection defined by the Australian standards & government workplace health & safety regulations so we comply with that.
Another can of worms to consider is the rigging qualifications of the pilot. I have a crane ticket & therefore I am qualified to rig a load, but there are no regs in Australia regarding pilots being trained on rigging. Ground/ship based crane drivers must learn how to rig a load prior to getting a ticket, gravity defying crane drivers don't. We're trying to stay ahead of the curve & get qualified for rigging loads before it's legislated or worst case scenario a lawyer points it out during a court case after an incident.