Serpentine belt part number/type

[Firestorm]

Hey folks, we are trying to get a replacement serpentine belt for our 2005 golf gti. we have found out 6PK950 but it is the only one listed and says for one w/o AC. that is the only one. another one is 6PK900 but again W/O AC. there is yet another part number listed by jetta 2.0L FSI which is 6PK1000and something(cant remember last numbers) and it is listed as With Aircon.
has anybody bought and replaced their serpentine belt? and which one is hte correct one? our gti has aircon. as i thought all of them did from factory. we can get a VW one through VW but price is so marked up as its VW, so can get a quality bosch one for a lot less. we are doing our own service to change fuel filter, oil filter, oil and serpentine belt whilst we have it on the hoist. it isnt due yet but not happy with what ever oil VW put in it (what ever they have on tap i think!)
thanks in advance folks

[Aussie Volks Guy]

hey Firestorm,

I would try South Yarra Auto parts www.hsy.com.au , or imparts www.imparts.com.au - they should be better priced & more helpful!

[Firestorm]

hello thankyou will give them both a try