Presence of passenger airbag depends on model year. Up to 87 (the 300SDL), there is a glove box, no passenger side airbag. The 81-85 models don't always have a driver side airbag either, I believe.

On the W124, the hose is solid rubber, not foam, but I've not dived into the W126 yet (probably this weekend).

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!