First things first fender in French is garde boue (literally guard mud). I would ask for help on tonton velo as I think someone else may have mentioned but you could also look at eBay.fr . Shipping will be horrendous. Here is a set not exactly same with only one painted stripe. You could try to get as close as you can and repaint the stripe to match.
https://www.ebay.fr/itm/284422636462...IAAOSw72JhJQt9 Judging by the cat on rear tail light that one is a s.e.v. marchal brand