Double disk converter?

[bama24v]

I bought a used trans from a guy off of cummins forum and it had 60k on a rebuild and he bought it from another guy who had it laying around. Well I get it here and get it checked out and everything looks great and I dropped it and my truck off yesterday to have it put in and I picked it up today. When I picked it up, the guy who did it (He builds all the transmissions for Southern Diesel Racing/Pulling in Orlando) said that the when he swapped my trans he pulled the pan off the make sure everything looks ok and it had a Transgo shift kit in it and the Converter I got with the trans was a double disk billet converter. I have been trying to find stuff on double disk converters and haven't been able to find much. Do they make them even? I trust the guy who did the job but not sure on the double disk converter. I thought the trans was a stocker so I was pleasantly surprised