I got the Spring Plate and Clutch in for the R100 this morning....you guessed it, wrong clutch plate was sent. I told him 1978 R100 and what here sent me I'm not really sure. It has the BMW spline but the diameter is wrong. The picture below shows the new plate resting atop the old. The new one is about 6.375" in diameter and the old one is 7.100 in diameter. Close but not close enough for me. I called the vendor but they are not open today so I'll have to call back on Monday. I did leave a message so they will hear my plea when they get back to the office.