On my 98 Ford Expedition the oil filter is located on the driver side behind the front bumper.
on the oil filter extension housing.
A bag filter housing unit is a device that secures the filter in place, and keeps it safe from damage. One can purchase them at large technological stores like Eaton.
ON THE OIL FILTER HOUSING
Right above the oil filter on the oil filter housing.
Its on the oil filter adapter housing and hard to get to.
It's called the IAT (Intake Air Temperature) sending unit. It is located in the tunnel housing of the intake between the filter and the throttle body. It will be a little switch with 2 or 3 wires running to it in the center or more centered towards the air filter.
The cabin filter on a Saturn I200 can be replaced by opening the glove compartment and accessing the filter housing. The filter can then be popped out and a new unit installed.
behind the power steering unit on the oil pump housing above the oil filter
on top of oil filter housing
If you are talking about a hole in the oil filter housing, that would be for the oil pressure sending unit.
Fram makes an OE replacement for the fuel filter that fits the 1966-1983 Ford LTD, the G22A. The filter is cylindrical shaped, brass-colored metal, with tubes at the top and bottom (longer at the bottom of the filter). The inside diameter of the inlet is 0.31", with 13-27 pipe thread. The inside diameter of the filter housing is 0.94 inches and the whole unit is 2.86 inches in height.
its on the end of the wires just above the air filter housing unit