substitute for 5 1/4 driver

scottym
scottym Posts: 5
edited April 2011 in Speakers
The driver in one of my Rt f/xs is blown and Polk does not carry the drivers for it anymore. Ii has a model # MW 5806. Ebay has some 5 1/4 drivers but they are MW 5530s or MW 5800s. Anyone know what is different about this drivers and if I could substitute them for my blown driver. Maybe i would need to change out both drivers for better compatibility?
Thanks
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