take a look at this pic.
http://www.skylinesaustralia.com/forums/in...t&id=126534
thats where i have mine connected. i went to repco (or most car shops should have them) and bought a screwin brass nipple. took the cooler pipe off and drilled and tapped a thread into it. then used som,e of that white plumber tape too seal it off so it didnt leak. you could also weld around it but mine didnt leak so i didnt bother.
search nipple there should be heaps of info on it
goodluck
steve!