I've not looked at mine, but it isn't the same as the one in the W115, I'm sure -- the cover is too small for the diaphram from the W115 to fit, whatever is in there.

You can also try some of the places that advertize in Hemmings Motor News -- that is the route we are going to new diaphrams for the 75 300D

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!