When did AU 2, 2.5 and 3 start

[5.8]

A mate just bought a 10/2001 AU XR8 with the 220 motor. I beleive this was un-officially known as the AU 2.5. It has the 220 motor, colour coded external mirror covers and the clear side repeater indicators. I think the 2.5's started in July 2001. Is that correct? A few other things I would like answered and I'm sure there is plenty out there that know!!
1. Is there any other thing the 2.5's had?
2. If the 2.5's started in July 2001, when did the AU 3's start?
3. When did AU 2 start production (I think it was January 2000)