All but the center vent actuator are easy enough to replace if you can work without seeing what your hands are doing. I don't know how pulling the dash makes the center vent one any easier to replace. I have a replacement diaphragm in the center vent actuator of the SDL because I couldn't figure out how it comes off. The lever end looks riveted to whatever it attaches to. Even replacing the diaphragm was a PITA.

Sixto
95 S420
87 300SDL