Here's the numbers I recall:
4937148, 2006 manual transmission.
4937149, 2006 auto transmission.
4931973, 2006 manual transmission.
4931975, 2006 automatic transmission.
4931978, 2007 manual transmission.
4931980, 2007 auto. transmission.
Something to note, the number 4931980 ECM has been used as a service replacement by MoPar.
I've seen them used on every other 2006-2007 5.9 application.
Be wary of these, they have been known to have issues with locking down if you try to reprogram them.
These units are usually readily identifiable, as they have no ESN assigned on a large sticker on the rear tag and they look rather "plain", as compared to an OEM assembly line unit.
All of these ecm numbers listed above also bear the "CM849*" designation, in the "CM" category on the large front tag. The "CM849" will oftentimes be followed by a letter designation, which is A-G.
Mark.