I've searched above and beyond and can't figure out which belt is the proper size for my alternator. From what I've found on the interwebz there are 3 different alternators which came factory on RB30 VL's, a Hitachi and 2 different Bosch ones. I've found that there are 2 different size belts 855 and 875mm, part numbers 4PK855 and 4PK875. I have this (http://ishop2.cooldrive.com.au/products/BXN1231A) Bosch alternator, would anyone with this alternator be able to check which belt you have? Should have a part number on the belt. Thanks.

there should be enough adjustment to fit either one? not sure but i just went down to the local parts shop and got one and it fitted

Just buy the smaller one and take a punt. Keep the packet.. take it back if its wrong