I do not have a photo of the steel replacement swimg arm,but EML replace the paralever on all models BMW when coverting them to sidecar combinations.
EML is Dutch based and is one of the larger sidecar suppliers in Europe.
See: https://emltrike.com/en/sidecars/modifications/

Rudolf

Morgan Aero8 S4 «Tango»
Fisker Ocean
Harley Davidson Livewire
BMW R100/7 , R100R
Moto Guzzi 254