IKEA Waxholm Sofa Connector

I have a IKEA sofa and a stool, that is not connected to the sofa. This connector is used to attach it directly to the rest of the sofa parts so it is no longer sliding away. The original connectors are made out of metal, but these seem to be rigid enough (PLA) to do the job.
This is best used only a additional connector (e.g. not for the sides). Rather tight fit!