400K and 800K Floppy Disk Drive Cable
Apple 590-0167 (red stripe) or 590-0437 (yellow stripe). Internal Disk Drive cable for the Mac 128K, 512K, 512Ke, Plus and SE (800K drive). Approx 6″ long.
Please do your own research, but this is what I have found:
The red stripe cable is for use with 400K drives and Black lettered 800K drives (MFD-51W)(MFD-51W-10)
The yellow stripe cable is for use with Red lettered 800K drives (MFD-51W-03)(MFD-51W-10)(pins 9 and 20 are not connected)