It happened quite a while ago. Stillwater/Kicker F'ed all of us Solo X owners. No SPAIRS, nor will they help you locate one, even just four days after they production they got pissy with me twice over it.
Not to worry, Dave of FMS/TeamPSI can work some lovely magic with them. He says 50/50 chance on reconing them keeping them square, well, no moreover that is it possible, and well, I will say, 100% chance of round drivers. He has built some NASTY 18" drivers utilizing Solo X 18" motors. I am thinking of sending mine to him and having him build mine round with an 18" Ti basket, but perhaps once I blow my fully functional driver or if I get some sweet arse offers perhaps I'll send Dave something else just as ****** (not really, only about 80% ******).