407 3.stop lamp socket

Hello friends, I took it to the auto electrician because the 3rd lamp on my rear window did not light up, he said that the fault was from the socket, and after cutting the socket, he connected the electric cable directly to the stop lamp, the stop lamp is on, but when I press the brake on the trip computer screen, the stop lamp malfunction warning appears. I took it to another auto electrician, he said that the fault warning came out because there is no socket, where can I get it or where I can find zero socket friends, I would be very glad if you help, thank you.

friends, there are sockets in aliexpres, but it asks for the type of socket, for example code like H7, peugeot 407 3.stop lamp is what type of socket is it or if it is a usage booklet, maybe there is a socket type writer but where can I download the booklet?