What size wrench passanger side oil cooler
 

So my passenger side oil cool leaks. I have a replacement cooler. I read the the wrench needed to disconnect the hoses from the oil cooler it's self is a 23mm. I got one and it's not even close. The walk to Sears is about a mile. What size do I need before I make that walk again?

Measure it!

are you sure you actually got a 23mm socket? all the OEM oil cooler banjos have a 23mm socket head, so unless it was replaced with a non OEM banjo it should have fit.