'96 up GT / Cobra oil cooler O ring kits. Impossible to find anywhere else, Ford sells complete new units only, no parts. Be sure to buy kit + extended service kit and do it properly the first time. Tell tale signs you have a problem, most common is an external oil leak. Address it now before you start sucking cooling into your oil.

http://www.speedconcepts.net/product...4e15e29e260b9d