4x PRC5477 Land Rover 90 110 Defender FFR Wolf 24v terminal box shunt box
These are getting more and more difficult to source and now four (!) are offered at once. Their condition and completeness varies, but I’m confident you can make two good functioning ones and have a lot of spare parts afterwards.
Price is 250 euro’s for a set of 4 pictured boxes
From the MOD manual:
The terminal box is attached to the panel behind the left hand seat. Auxiliary terminals are provided for operating 24V equipment while the engine is running. The socket on the left hand side is an alternative to the terminals for carrying a charge to the radio from the batteries stored under the table. It is also used for charging additional radio batteries which are housed in the battery stowage box.