The coolant/heater fittings used on the 1600/1500 water pump and head.
 
Correct threads of course (Not NPT!)
 
Select correct length for either position-Same price!  
 
Custom made CNC production Brass - no plating, no rust, no seizing, an excellent part at a great price!  Why pay more?
 
Brass is actually more expensive than stainless, and better for many applications...DRP always brings you the best!