Where did you found parts?
The hinge (is that the right word ? ) replacing the original has to be handcrafted.
It would be also possible to rework the original part, but I want to keep all the original thing as they are , to be always able to go back.
For the rear/stop/turning lights there are a lot of manufactures from cheep chinese , to expensive, check ebay ...
Another good starting point for a search, may be the rizoma web page:
https://www.rizoma.com/universal/indicator-lightsMy plate lighting comes also from Rizoma.