Your 242 is dated 06, so its probably the good one.
There are two different 242's that can go behind the 3L80 trans....one has a 3 bolt tail shaft, one has 4 bolts.
3 bolt one has a smaller slip yoke.
I've had 3 and 4 bolt T/c's with the blue band on one tube.
The 4 bolt tail shaft T/C is also the one that fits behind the 4L80e trans.
Each one of these T/C's has a different rear drive shaft.