Fiat, Peugeot, Citroen EASYFIT Demountable Floor brackets.

GAS IT Technical Documentation.

If your fitting a EASYFIT GAS IT tank with factory mounted feet on them, then these feet have to be at the top at all times as this is because the pickup pipe, the fill valves and all other items in the tank are set for the tank valve plate to be at 105 degrees, which is automatically set if the feet are on the top.  do not try to mount the tank so the feet are on the side or at the bottom as this will be dangerous!