Try your Renault Dealer. I needed connector inserts when modifying my wiring (albeit 20 yrs ago) and I remember the stores produced an electrical book with all the inserts used in Renault cars, and I was able to identify the ones I required, I ordered them. They arrived, and I was able to complete my mod.
I would take an existing one to the garage with, say, a vernier gauge because there are similar ones that are smaller or bigger than the ones you may require, so to be able to check measurements with the book (computer now, I expect) is essential. This is how they come all attached together:-
Hope this helps.
1990 GTA Atmo, 2003 Jaguar X type 2.5SE Auto, 2018 Kia Picanto GT-Line-S 1.25