I think you need to talk to stijn, I got some 16 V parts from him several years ago, he does a load of crazy mods...
http://www.volksforum.com/users/stijn/71/71.htm
that is the 16 V into a notchback, so he must know something about hooking up a watercooler to a type 1, 2 or 3 transaxle...
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