The airbag is a piece of cake, just unplugs after you remove the 2 torx bolts. You'll see what I mean about snaking the cable. Trust me, it's no big deal. The hardest part is probably getting the knee bolster back in place. Let me know how it goes...

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280