and both were made by WAECO in Germany.
One for the front armrest,
the other one for the rear armrest.
But they are very rare to get nowadays and cost a lot of money.
There is actually only one on the market at the moment, I wonder how much that will fetch
http://cgi.ebay.co.uk/BMW-E34-5-Seri...QQcmdZViewItem
WAECO has now the Tropicool Borad Bar and Armrest box, which is held by the center seat belt. That is not bad and reasonably priced/ See here an offer from Germany
http://cgi.ebay.de/Waeco-Tropicool-B...QQcmdZViewItem
Most motor factor shops sell small coolers that run off the cigar lighter socket. i'm sure there'd be one out there the right dimension to fit the aperture or even sit in the trunk/boot.
Be warned..even tho these are not fridges they will eat the charge & soon flatten the battery if left turned on!
I have a fridge installed in my Highline 750iL. Never used so far. Just as storage.