perfect, except for the rubber sealing of the original boxes

The rings fit perfectly in the front doors (VW Passat 3BG Bj. 2001). The pit (Helix E62C) will fit very well. Only when the door cover the rubber ring (boxing seal) does not fit exactly (because the original VW boxes fit exactly into this ring or slightly smaller than the standard sizes), but the rings are a little too big. You can remove the rubber ring from the door cover and the cover can be assembled easily, but you do not have 100% more seal and the bass is a bit meager. But with a little muscle strength succeeds but the door cover with rubber ring on the ring push over, thus sealing fit again and the boxes can bring their power to bear!