I recently purchased the HSP factory coolant replacement reservoir for the 2007.5-2010 GMC/Chevy Duramax. It fits perfectly in the stock mounts in a sleek design that no one else offered that I could find. I'd definitely recommend it to someone looking for a sleek upgraded reservoir. My only complaint about it is there is no sight glass (if you will) to see where the coolant level is. Other than that I love it. 10 out of 10 would recommend. Look forward to buying more high quality products from HSP. Max air flow kit is next in the list!!!! Thanks guys.