A while back, my CK30hst is a 2004 model, Kioti had steel lines going to the cooler which helped the cooler vibrate and leak. Kioti's fix was changing the steel lines with rubber. Mine was under warranty. It still leaked after the rubber lines and members were using rubber mountings on the two top mounting pins. I did that and good so far with 250 hours on a new cooler. The old coolers had small fins like a radiator. I saw a Bobcat with round tubes in the cooler which is what I think Kioti switched to. Give Wallace a call. He sold both and probably could tell you in his sleep what is needed. He's also fair on parts and will gladly ship to you.