Can anyone identify these 12 inch woofers ? They are cast frames 5 & 1/2 inches deep and a fair size magnet of 1 & 3/8 thick by 5 & 1/4 inch diameter. The model numbers? Sereal numbers are L12 PN. 2110070-90-1 and the other numbers are 060530. Same numbers on both speakers. Thanks for any help...