T4 alternator with ac belt size?

[Abyss]

Supercheap even have a lot of sizes (but not mine) and a gates v belt measuring stick!

[Abyss]

5yrs later, Google pointed me to this image when I was searching for a new tensioner pulley, and hang on, that's my image and van lol.
In the end, the belt I used on this setup is 6pk1575...well today the pulley shat it's bearings so a nice two hour drive with strong arms was needed!