A suggestion for #16 is: "The Bolts".

The bolts on these trucks are notorious for breaking. Regardless the reason, caution should be taken, and PATIENCE exersized, when proceeding to remove bolts, particularly those subjected to rust and temperatures.

. Allow ample time for bolts to soak with PB Blaster or Liquid Wrench. Saturate them good, overnight if possible, with a few periodic applications.
. On studs, [i.e. exhaust manifolds], some wire brushing removes resistance of rust and dirt. Then a pre-soak with bolt loosener.
. Sometimes, the bolts will break, anyway. Be sure to use anti-seize compound on replacement nuts and bolts.
. Know that when you have impossible broken bolts/studs, you have plenty of sympathy here: not one of us has experienced perfect repairs or the absence of breaking bolts.