Help finding a replacement rear derailleur

Woody_woody_woody

Retro Newbie
The rear derailleur on my vintage (1985/86) Peugeot P 10M Premiere has finally died.

I'm looking for help on finding a replacement. Can anyone help tell me what I need?

Beyond the Simplex branding, I can't find any other model details on the defunct part.

Photo of the broken part:
 

Woody_woody_woody

Retro Newbie
Thanks @Nob . I hadn't thought of doing a search of eBay - doh.

Any idea if these things came in different specs as for sizes or the amount of travel the arm moves in and out?
 
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