97 Ford explorer o2 sensors and misfire codes provided

Hi guys,
Did an OBD 2 scan of my 97 Ford Explorer v8 5.0L. It came back with
the following codes.
PO304 ---------cylinder 4 misfire
PO153 ----------O2 circuit slow response bank 2 sensor 1
PO133 ---------- O2 circuit slow response bank 1 sensor 1
PO171 ----------System to lean

I am looking for a couple of pieces of information that maybe
different people may have experience with.

1. Do all these put together indicate one problem or multiple problems
that need to be addressed

2.The O2 sensor has not been replaced since I have owned the truck in
2000 so I imagine that outside the misfire on cylinder 4 these are
overdue for replacement.

A) Are the O2 sensors the same in all locations or are
they different types, (i.e. can I order 2 of the same or are their
differences between the O2 sensors located in different locations of
the truck.

B) Anyone knows a website with pictures of the locations
of these sensors, or can describe these locations.

Any advice or how to's is greatly appreciated.