Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
i think the above is true for s2 vn in MOST cases. I ordered the vn s2/vp/vr sensor off ebay, (the bigger black plastic one) but when i pulled the old one off my car it turned out i had the smaller white plastic, alloy bracket s1 variant. My car is definately a series 2.vn s2/vp/vr buick and ecotec cas's are interchangeable (only one that is different is the s1 vn which is held on an alloy bracket and is adjustable)