There was a change with the TDI squirters, but I don't recall if it is mid-run on the AAZ or mid-run on the AHU/1Z. They went to a single hole banjo style squirter instead of the 1.6TD style that has a hole for the oil valve and a hole for the bolt.
All the AHU 1Z ones I have seen are identical to the 1.6 ones. I've taken apart 99 AHUs as well. I have a bunch of used ones available if you need that style.
According to ETKA they changed the squirters mid-run of BOTH the AAZ and the AHU. The transition block number for the AAZ is 720935. The transition code for the AHU is 100000.