REL replacement drivers

Does anyone know of a replacement driver I can use for my damaged driver in a REL Q-Bass. The original is a 12" 'Westra' model which is also the same as in a REL Q-100, but my web searches show that Westra were taken over by another German company called HKM (HandelsKontorMeindl). I would like to avoid paying a lot of money to REL to be supplied with a third-party driver I could have bought separately myself!
 
Simon5 & richi00boy,

The driver is a 12inch unit in a sealed box about 14 x 14 x 15 inches internally. Taking a bit away (say 4 x 4 x 15) for internal electronics leaves about 2600 cu. inches, or about 1.5 cu ft.

I'll have a go at contacting bkelec and see what they can do. Thanks guys.