Yes, I sent the guy a message letting him know they wouldn't work on the DFX and he pretty much brushed it off and then said "well, they will at least have a couple of extra coils that will work on an XLT". The point I was trying to make to the guy was that not everyone would know that the 6.59 kHz coils wouldn't work on the DFX. There is actually two different guys on fleebay selling DFX's with extra coils that won't work on the DFX.