I am going to try and answer a couple of questions here. The number on the cone MW E120 is that of a aftermarket parts supplier. As far as I know it is the best aftermarket cone available for the K/E-120. Here is the Aftermarket Story in a nut shell. A very small number of companies make raw speaker parts (voice coils, spiders,cones,dust caps and gasket sets) NONE of these manufactures sell recone kits. The kits that are out there are just assembled by mostly speaker distributors that have recone shops. These kits are only as good as the parts they have decided to use and quality of their workmanship. Even with a good recone kit, the final assembly and technique used play a very important part in how the speaker will sound and preform. The Factory kits that JBL currently offer for these speakers are all the same except for the impedance. Further more the E series kit differs from the K series and the D series. These kits will work, But they will SOUND DIFFERENT than ORIGINAL. If you use a E series kit in a D series speaker it does not make it sound like a E series speaker. There are a number of reasons, for this maybe we can get more into that at a later time. On the plus side, It is no problem to change the speakers impedance by using 4/8/16 ohm voice coil.