I've seen cooling jackets, coils, tubing, and fittings such as these for boats.
http://www.offshoreelectrics.com/pro...m-neu1512-1515
http://www.offshoreelectrics.com/pro...prod=cen-bjs02
http://www.offshoreelectrics.com/pro...=ose-t-fitting
I'm not sure if this was the real deal or prototype
http://www.finedesignrc.com/ct-infernoGTreview.htm
What other components like radiators, pumps and coolant are out there to achieve a liquid cooled system?