Ok, before we have a fight over a cargo swing here is my guess. EC incorporates some hooks and swings into their maintenance Program as standard and these are part of the SB kits. These inspections are addressed in the Airframe Maintenance Program and their inspections reflects on the standard servicing schedule. All slings and swings are not part of the EC program and can only be fitted under a STC and they are not addressed in the standard maintenance program.
Now, Onboard or Siren for instance does not manufacture a cargo hook per aircraft type but in weight classes. So, if you fit the 1350kg hook to the 130 it can lift 1350kg and if it is in the EC catalogue it is a standard option one-however the airframe is limited to 1160kg due to the mounting of the swing and thus how much the airframe can take. Why 1350kg hook, because that is the weight class of the hook and can be used on B3 for instance. They will not go recertify and design and build a new hook so it states 1160kg specifically. There are 850kg hooks on the market you can also fit to the 130/B3/B2-they are closer to the B2 limit and obviously slightly cheaper.
Hope this helps????????????????