As anyone knows, who's looking for a replacement coolant reservoir for a GM 6.5, there's pretty much nothing available since GM discontinued the part years ago. I've searched for two years for something aftermarket, and about the only thing I could come up with was a kit put together from a reputable company that supports 6.5's with aftermarket parts and support. However, that kit is not a "perfect" factory replacement. I just so happened to stumble across this product from Kloc on a 6.5 forum a few weeks ago, and much to my surprise, I believe they're the only ones so far that have came up with a OEM style replacement. And boy did they hit a home run on this one!!! The build quality is phenomenal!! Who ever does the Tig welding on their end definitely has a gift for it. The welds are a work of art!! The reservoir came very well packaged, and the company even included a personalized thank you note on the invoice. I'm sure to some that doesn't matter. But in my opinion, it definitely speaks towards the level of professionalism from this company. If they can deliver like that on all their products, they definitely have something going for them. If your in the market for a replacement reservoir for your GM 6.5, this is the ticket. You won't find anything else of this fit and finish for the money. I do believe this tank is better then an OEM replacement would be, provided that they were still available. And a OEM tank from GM would most likely cost more then this one.