ChargerGuy, look over in the For Sale section. DanNM has a 4x6 shooter coil for sale under "FS Whites coils....DFX, MXT".
I just used mine yesterday on the MX-5 in my very iron infested yard. I was amazed at the nonferrous stuff I pulled out that I've swung over dozens of times. I have even hunted it pretty thorough with a 5.3 eclipse concentric coil. I believe the 4x6 shooter DD coil gives even better separation.