HEAD BOLTS (Each)
These head bolts are typically replaced when you replace a head gasket.
Can you get by without replacing them? Maybe. There are a lot of things in life that you "might get away with" but might not be worth the risk. If you enjoy working on your tractor, drilling out broken bolts, and fixing things then it might be worth re-using them. If you want to do this once and not think about it again- replace them!
There are 18 of these used on the 4 cylinder engine.