I live in a land where plastic rusts. Doing the valve seals debacle I had to pull the headers off. I noticed the bolts were rusted. Okay go to jungle store and order SS header bolts. Go to install headers and new bolts.
Grab 3/8 socket... what the ?? Does not fit. Try other sockets/wrenches, Nope. Grab 10mm socket and a perfe ct fit. Why machine a 3/8 thread and use a 10mm head?
Bet you can guess where the bolts were manufactured.