Changing the straps and housing is pretty straight forward. Two 10 mm bolts where the strap enters the door and another two just a few inches from the doors edge under the door's panel. Mercedes door panels are unlike most and if you are not familiar with the procedure of removing them you will likely cause serious damage. They do not pop off... they must slide up and then out... Also be familiar with how to remove other attachments connected to the door and panel.
Tools reqwuired: 1/4" drive rachet with short extension and 10 mm socket. Flat head screw driver, Phillip's-head screw driver, needle nose pliers, hammer, punch and a human level of intelligence..
1993 190E 2.3
2000 Toyota 4x4 Tundra