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Thanks Geoff. This probably sounds daft, but I've sat in T17 on many occasions, including this year but I'm trying to work what letter the top row is. I have some photos which give me pointers to the numbers....
There is a picture of T17 in this article so you should be able to work it out from that! http://www.dailysportscar.com/2018/06/03/major-grandstand-upgrade-planned-for-le-mans-centennial.html