I have a 2007 Z06 and replaced mine with a Dewitts several years ago and it works better than OEM. It's dimensionally interchangeable but that doesn't mean that it was easy to replace! There's just lot of stuff that has to come off and go back on. I did it by myself and it took me the better part of day. Good luck!
Also if you have problems with the fittings that I had on my C4 try www.fittings.space. They have all types of fitings. My radiator was metric and transmission oil cooling lines were NPT.
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