hi I got a new audi a4 2006 t s line b7 cabriolet / convertible . The front passanger side seat has airbags and heated seats . The seat moves forward and and backwards , although it does not click into position or the seat backing or backrest does not fold backward. its constantly moved forward . so sitting in the passenger side is impossible . the track lines are free and when i drive the passenger side seat just moves forward and backward. never locks in . sitting is impossible as the back rest does not go all the way forward or all the way backward . The seat moves on the runners backward and forward. Has anyone else experienced this and found a fix please? if so do you know what parts i need from audi out seat parts. just wondering what latch mechanism i need to click the seat into position and what i need to move the backrest of seat all the back please .