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The seat shift STC is one of the best investments anyone could make.
If you learned in an older type air frame, the window is a PITA - but the seat shift allows a seamless transition from say a Lama or Longranger to the AS350 series. Cheaper than the floor window and you can see the load directly at all times- it fits regardless of pilot size. I have no connection with the manufacturer, just an occasional happy user in times past...
Happy trails...170
ps. I checked about European STC approval a year ago and it was still in the works, but I don't know the latest news...