I bought the last year one pair of D16R2405 dias. Unfortunately I did not examine with great care diaphragms since at that time I did not have 2405 bodies (they are very difficult to be found in Eastern Europe). Finally when I tried to assembly everything, now when I have bodies, I was negatively surprised what I saw. One diaphragm was good, but second could not fit. I did not want to force anything when I saw that flat wires which go from voice coil have very strange curvature and bending. I will not mention cosmetic things which are obvious on that diaphragm. Did someone encounter this? Because of this unusual curvature there is 0,2-0,3mm gap between diaphragm and body and if you gently press you see that there is some kind of impact on aluminium on diaphragm. Deviation of flat wires can be seen on both sides of diaphragm. Couple of year ago I bought D16R2405 and did not have any problems. Also it seems it is missing mark for polarity, now you can only see some kind signature.
Best regards,
Zeljko