Replacement driver for old REL Q50 sub

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Before completing a brand new sub woofer I'm working on, I thought I might upgrade my old REL Q50 in the meantime.

I'm looking for a replacement driver, good quality, with the same chassis size as the old REL, as I don't want to get into any woodworking or trying to enlarge or alter the existing opening.

Obviously the driver should be a sonic upgrade [shouldn't be too difficult] and work in a sealed enclosure size of 40cm x 40cm x 40cm. As I'm based in the UK the driver needs to be sourced from here. I wondered if abnyone would have some suggestions ?
 
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