Bingo on the Chevy product being for the new 1/2 tons.
If you go to the website and click on the "spy" link on the bottom, there is a preview of a coilover for the new 1/2 tons.
P.S. I have Donahoe stuff on my superduty now. I'd run it over KORE as it is just as good, but barely more expensive than Fabtech. Compare it to KORE and the premium doesn't seem worth it.
And Donahoe has the best customer service of any company I've ever dealt with. Talked to Kreg numerous times, and he helped me get exactly what I wanted.