Find an Industrial fastener supplier in your area - forget "marine" sources. A good industrial supplier will have or can get the most mind boggling array of fasteners in any material.
I was in my local one - Pacific fasteners and they had an absolutely HUGE nail on a display board. This thing must have been three feet long and an inch & a half in diameter. It made a railroad spike look like a brad nail. Turned out it was used as a tent peg for circus sized tents.
Does Worst Marine have that sort of selection?
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.