Safety and peace of mind is found in Titanium, though at a price. Steel is the overall champ in safety, but it only needs to be applied to certain critical places. Case in point, some of my buddies have mentioned why not use aluminum bolts for the pulleys,oil pump mount and such. I said, that was not logistical and from a engineering stand point, quite unrealistic and unsafe. I'm not an engineering expert or even a metallurgist, but I do understand real stresses and centrifugal forces that do things to things over time. Certain items should be left alone and others can be fiddled with.
The fenders hang with good grade aluminum hardware because of the vibrations and oxidation, but in some cases, you can get away with certain fasteners because there are multiples of that fastener holding the item like the pan.
I've got to flic my Radiator and trans cooler which is just as big as the Radiator itself, but the same as yours, aluminum hardware and brackets everywhere.
