Dear Dan,
I have checked your chassis number against our records, and I can confirm there are two posibilities.
If your car is standard, it has BMW final drive part number 33101428465 which has the ratio 3.07:1. If this is what your car has, you require 33-468-302.
If yor car has short final drive ratio 3.46:1 (BMW part ref 33107529494), it requires 33-878-130.
Both units are 829+VAT and shipping. If you want to order, let me have the shipping address, and I will check what yoiu have with BMW.
Med Hilsen Quaife