Spares for Trumatic C controller (1 Viewer)

[Homer-Adria]

Hello,
Does anyone know where to get a replacement dial/control knob for a Trumatic C controller? I've attached a pic.
I've contacted Truma and this part is not sold as a spare part so I'm hoping theres a non OEM supplier out there or someone breaking an old/unwanted unit.

Thanks

 

[SOS]

Did you have any luck in sourcing one of these? My dial is broken as well.