They are comprehensive manuals, and the R109 chassis is very similar to (and derived from) the W124.

No air filters before 1992, I think, except maybe the R109 chassis. Certainly not on an 87 or 88 (I have both).

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!