HI, Close, but not quite right.
The 03 in its first 2 batches had a 5th Element shock, this was 200mm with a 2.25 stroke. These also had a bushing shock short link. I had one of these and got it from the factory.
The late 03 went up to a 220mm shock with a 2.5 stroke also on the 5th element. Yeti also changed the layout slightly of the front pivot point to stop it cracking a little. These had a short bushing link too. The later 03 also had a double thickness plate where the dog bone fits.
You will notice that all the 03-07 have the same travel measurement on the little adjuster holes, I think only the longer shocks gave this travel, the short 03 shock gave 6.9 at max (so I understand)
the 04 also had a 5th shock (my mate got one), it was not till later on in 04 and early 05 that they came with a DHX. The 04 got a bearing short link early 04, but still came with the 5th. Mid to late 04 saw the rear end have a slightly thicker 'rim' inside the cut out of the drop outs.
Then in 07 some AS-X came with a DHX air (French market), this had a more trick short link with smaller bearings, this was also on the 07 that had a DHX coil.
Yeti did changes throughout the run of the AS-X, so to say an 03 had this, and an 04 had this is not quite correct.
hope that helps.
Andrew