cooling system leak

I have a 1990 I6 4x4 xj with the stock cooling system and cant find the replacement part that is leaking.

I will do my best to describe what the part is w/ out pics, my camera is on the fritz as well

it is the metal line below the reservoir that splits the line to go towards (or from) the heater core and towards the radiator.

Thanks in advance for any and all help

http://www.teamcherokee.com/Cooling/index.html

...or I have a used one I'd be willing to part with (no rust) for the price of shipping.

$5-10 or so.

Also available at parts stores such as O'Reilly and Autozone for ~$35.