I couldn't find the factory replacement drivers for mine, and didn't want to change why I bought them, so I don't use them anymore. I did use them for 28 years so I am not complaining.
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Are the 4 internal bass drives of your 104/2s totally shot? There are rebuilding services for them.
Here is one example.
Also have you tried calling KEF in NJ? A couple of years ago I called them and they had the replacement woofers in stock.