Seat creaking fixed on driver's side was the seat bracket (scissor bracket) hope that helps. Seems the passenger side is also doing it but much less.
2013 BMW Alpina B7x SWB Alpina Blue
2013 BMW M6 Coupe Brilliant White Met. Akrapovic Evo full titanium, AMS Alpha DPs, Gruppe M intake, HRE S101s 20s, full BMW M perf parts, comp springs sway bars, awaiting Dinan, 630hp 570lb/ft