yes part #18 or is the secondary the one mounted on the rad on right side . primary fuel filter is to catch all the debris/dirt from the fuel tank, secondary fuel filter is going to the fuel pump since fuel has been filtered twice before going into engine. usually fuel filters are mounted close together. i never saw live this kind of mounting.. i could be wrong as the one on the rad could be primary and the one on engine would be secondary...
part #116or, that you circled is the power steering reservoir .the two tip that it has on the bottom is for 2 oil lines ,since it has 2 steering box.other lines goes at the power steering pump on engine.