I did the upgrade a few days ago, and here is my update: 1. I installed Focal IS VW 165 (2 tweeters and 2 woofers) in the front. I also put some sound deadening inside the doors, as much as I could without dismounting window lift. The sound has definitely improved. Where there was just mush instead of sound, now I can hear proper distinct sounds. Especially noticeable on lower volume. 2. I encountered the connector mismatch problem. First, I tried to find proper adaptor and failed. Maybe there is such a thing, but I was unable to find something 100% compatible and ready to order. Then I realized that the connector could be disassembled easily and plastic housing could be removed from the wires. I found VW plastic housing p/n is 1J0972704, which looks like the one that will fit both the metal connectors at the end of the wire and the speakers. I ordered it, and I'll find out later if it actually fits. 3. But, as I wanted to check new sound setup here and now, I was looking for immediate solution. To achieve this, I cut corners, literally. Metal female connectors of the Skoda wires fit speakers' male connectors perfectly. The only differences were in the plastic locking tabs and guides. So, I fine-tuned them with a knife, and got everything connected. Actually, I don't know if it's worth replacing plastic connector housing now… 4. To be honest, I still have one concern. Have I connected proper lines? I had no resistance tester at the moment, but speaker itself has only two electrical contacts, and I assume that four outer metal pins are short-circuited in pairs. Therefore, I connected to couple of pins in the middle, red wire closer to the '+' sign, and it seems to work fine. I would appreciate any advice on this matter.