On the polk audio site go to the "club polk" section. They have a list of all available drivers and crossovers for sale, I am pretty sure you can get the ones for that speaker.
810665:115DT 26/72 SF (Used in older Polk Systems)
Call madisound, what appears above was pasted from the madisound website under the Peerless driver section. There is also a link to the peerless website from the madisound site you can see a picture of he driver there.
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