Hi Mattias, the card under the Multiplexer is a 82E213.
I've dug in the boxes and pulled out a 82E212 and a 82E213.
The 213 misses it's two DBX202XT, but that's all., you can fit any 202 or 202 clone.
Spare Stereo cards, are super rare.
If your interested, both cards all in for £75 shipped.
Andy