Psi is fixmyspeaker.com they are the biggest,do great work, and are pretty affordable, the rest can be found on facebook, not sure who all is still building but Im pretty sure Cory and Dave still are, Dave does some of the best work but will probably cost a bit more and take more time, Corey was always fast and affordable. If you wanna find them id ask around on some car audio pages on FB, not sure how else to get ahold of them anymore(been off Fb for awhile now) All of them should be able to build it for you or send you a drop in recone, just make sure to take your time centering the coil and use the right glue