Holden changed the length of the dipsticks in later models. Here is my VT Series II dipsick measured against a friend's VY Series I dipstick.
And a close up of the business end. As you can see, it is basically 1cm shorter.
To save you having to read from the photo, the key lenghts of the VY dipstick (shorter and cleaner) are :
|cm||Length from yellow lip in cm|
|54||Start of wavey bit|
|55.5||End of wavey bit|
|56||Start of Good range ie. Full|
|57.4||End of Good range ie. oops|
|61||End of dipstick|