Cylinder is called two way cylinder, 5 min job to change, watch your fingers!
Like this but check its correct for yours first, ebay.co.uk/itm/DAF-MAN-Worki … Sw7NNUGElk
Before replacing the bag check all the little pipes and valves for leaks, the favourite is called entry/exit valve.
As a general rule xf have posher seat than cf hence the extra cable for the seat damper