I'm not sure I've heard of anybody actually selling the seats out of their bus (except for steel recycling). The situation with the door cylinder is probably only slightly better: the cylinder actually is useful, but anybody who has good money they want to spend on a pneumatic ram probably wants it a specific size, new condition, more than one available, etc.
Keep it and nourish your inner mechatronics nerd until you dream up something wonderful. You've got a ram, a few solenoid valves, a separator, a handful of rods and clevises..
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