Passenger Seat out of 85 SVO, cloth, with seat track & manual lumber inflators, 44.25 LBS
My guess after removing seats many times from my LX and my wife's Cobra was a little less than 50 pounds, so I would think most Fox seats would be right in that ballpark.
The SN95 leather front seats weigh 36lb without the seat track. The manual seat track weighs 7lb and the power seat track weighs 13lb, so the total weight of the passenger seat is 43lb and the driver's seat is 49lb respectively.