Totem rainmaker woofer

One of the woofers has started making a noise if you turn up the volume a bit and by looking online, I am having no luck finding a possible replacement. The dealer wants way too much for a new one plus I was informed since they changed the design and I need to buy two. It's a 5.5" 4 ohm with a bolt pattern of 6 that seems to be one of the problems matching.