There are two parts that work together. There's the T-ring, which is particular to your camera; and there's the T-adapter, which is not. As a general rule, T-adapters are not specific to the scope - they either have a 1.25" barrel or a 2" barrel, so it's really a matter of what size focuser your scope has.

I'm not familiar with the particular T-adapter you've linked to, so perhaps someone else could offer more definitive commentary on it. If I understand correctly how it's intended to work, the wide end would screw into the rear cell on your SCT, where the narrower end would screw into your T-ring. I'm more familiar with this other model, which works as I described and should also, as far as I know, be able to work with an SCT.

The Celestron t-adapter should work. Amazon has them for $20:

http://www.amazon.com/Celestron-93625-Universal-1-25-inch-T-Adapter/dp/B0000665V6

One end fits into the 1.25" adapter and the other one has t-ring threads. I think this is what you're looking for.

I went ahead and looked up the adapters you would need to hook up to an Orion telescope, the t-ring and the camera adapter. However, this looks like it can total to over $60 for adapters. Apparently the Orion T-ring and a Celestron camera adapter are most frequently bought together. I'm not sure of how the two different brands will work together.