900SS headlight

The shell of my 79 model 900SS headlight is corroded inside- a dead cert MOT failure. Apart from genuine Ducati sources, are there any other bikes that use the same headlight, or is there an alternative item that looks original?

I’ve got a Cibie unit fitted to my old girl.
I’m not sure where you’d get one of those now though, I’ve had mine for over 25 years.

Steve R