I don't know anything about replacement companies, I removed rear glass from my former A80 using bike brake cables at first, but these proved to be weak, then someone gave me advice to use wires from handbrake cable, turned out to be good, needed 4 or 5 of them to complete job [1/3 was done with three bike cables]. With help of friend, because one must be inside car and one outside. Of course, part of sealant remains with glass, so it must be removed with sharp knife and some chemicals after that.
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