I needed one replacement driver for my AKG K81DJ headphones. I got in touch with AKG but the headphones are their consumer grades and they absolutely refused to provide any spare parts. They suggested I buy new headphones. In the end I posted a wanted add here on head-fi and a fellow head-fier head one to sell.
I'm not sure if the 450's are 'consumer grade', if so, you might be stuck in the boat I was in.
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