You probably don't need a new socket, I think. It often happens that the socket comes loose from the front plate and falls behind the B-pillar cover. We have had this happen to us just this weekend... So yours is probably also just dangling on its wires behind the cover.
The socket is clamped to the front plate (with the lid) with two plastic prongs on the back of the front plate, that are just too weak. When you push a little hard, the socket may be pushed to the back, out of the prongs, and fall out. You can find many postings on Cali-forums about it.
This gives you an idea how it looks when the socket comes loose from the prongs...
The prongs should be fastened like this:
Our solution was to pry the bottom B-pillar cover loose, pick up the socket that is dangling from its wiring behind the cover, and stick it back into the prongs. And then attach a tie-wrap around the prongs with the socket back in, so that the prongs cannot open inadvertently again when we push too hard for them.
Prying the B-pillar cover loose is not difficult. Start at the bottom door side. They are fastened with some kind of plastic hook there, you can easily push it in. Then work your way up with your fingers behind the door rubbers, you will find two more metal hooks higher up. Push the cover gently towards the outside of your van, and you can easily work it loose. The rest will show itself. Careful with the alarm switches and wiring - you don't want them to come loose or be damaged.
Don't try to pry the top cover loose if you don't have to. It is a big fumble to get it back because it is difficult to align the cover part and the pillar part of the safety belt adjustment mechanism correctly when you try to put the cover back on. It is doable (we did it), but it took us a lot of tries and I have a lot of cuts in my fingers from the sharp plastic edges of the covers...
There is an other 'solution' advertised on several boards. The socket front plate is attached to the B-pillar cover with a sort of plastic pop nails. Some people simply cut them through by working a sharp knife behind the cover plate corners, and then they take off the cover plate. Fish for your socket, put it back in, DON'T FORGET THE TIE-WRAP !!, and then put the cover plate back on with 4 small screws.