Does anybody have any idea where I can find a midrange to replace the mid or mids in my Sansui SP-20000's.They each measure 5 7/8" x 5 7/8"...........I know I will not be able to find originals being these peakers are very rare but if I can find a good replacement that would work tnly one of the mids is not working.Here is a pic of my exact speaker's to give you an idea of what I am looking for.