Thank you very much for the link Arfon, I bookmarked this supplier, they look to have a lot of interesting things.
Regarding the loom, yes, they have universal looms, but I guess I will have the same problem with the connector.
The price is about 200€, and even though it is a big expense for the car, I could have think about it seriously if I was sure the loom would be "plug and play". But if I have to struggle with the connectors as TT seems to confirm on top of this expense, I don't think it is worth it...
Humm... hard to make my mind...
Thanks for the infos guys.