I've not changed a starter on one of these trucks, but literally 100s of different starters and the hardware looks like nothing special to me. I have seen some copper colored lock washers but very rare. normally just any floor stock is fine. the heat comes from loose connections not really the current running thru it.
I've found the ones there have flange nuts are nice, they don't have washers to deal with. either way, nice and snug, can't move the cable by hand but it's just a stud with a square head inside a hard plastic. when they are old they get brittle too. so lock washer or new flange nut. snuge it down and hopefully it helps.
the one on my c6 was so brittle it broke before the nut came loose haha. had to order a solenoid
I've found the ones there have flange nuts are nice, they don't have washers to deal with. either way, nice and snug, can't move the cable by hand but it's just a stud with a square head inside a hard plastic. when they are old they get brittle too. so lock washer or new flange nut. snuge it down and hopefully it helps.
the one on my c6 was so brittle it broke before the nut came loose haha. had to order a solenoid