I have a 1989 190E 2.6L and I need help with identifying which parts I need. The levers for manual control of the A/C vents are not functioning for the two side vents (left and right) and the one lever for the two center vents. The center vents are permanently open since I can not close them with the lever, and the sides are as well. All the levers seem to be unattached from whatever they end up moving. I'm not sure what parts these levers go to, or whether or not I need new parts to fix the problem. Any help would be appreciated