As I understand it, Pilkington is the company that now supplies the 2002 windshields sold by BMW. So, the only difference between a Pilkinton windshield and one from BMW is the lower price and lack of the BMW logo printed on the glass. I have a Pilkinton windshield installed on my '73tii using a BMW seal and it fits perfectly.
PS, it's true that most '72 - '76 US model cars came with green (tinted) glass, but not all of them. My '74 tii has clear glass that's original all the way around. Go figure,
John