This is a long shot, but it can't hurt. I need a 12" 4ohm MTX Blue Thunder subwoofer. I need the style with the black cone and the inverted dustcap, these were the late 90's models known as BTL's. Here's a picture of the same model in 10" for reference:
I have two already and could really use a third for an old school build I'm doing. Lemme know what you have.