Mike,

I've seen the diaphragms in Impco's Performance Products catalog for Mercedes. You can request a catalog at http://www.************************/ordermercedes.asp I've not ordered any of their parts yet, but they list what looks like this model diaphragm for $6.95 each. (They have a little trouble with terminology, as they also call the complete actuator a "diaphragm", but the price there is $66.05.) Since they have them, others are bound to as well. Let us know what you find; I will need to do this soon myself. My D is now limping along on two patched door lock diaphragms that I "McGuiver'd" tothether using a similar size diaphragm from surplus, some wire, and some silicone sealant.