Bert

I'm not sure if there is a part number for the original air filter. I've always run a K&N filter as they can be cleaned and reoiled and are generally as good as new when you have done it!

Oil filter- the original Ford part number is EFL500

Spark plugs - assuming you have a standard engine, then NGK BP6ES should be ok, if tuned I would suggest that you start at BP7ES

Arwyn