That's easy. Don't buy one from Kings Bikes, it's cast aluminum and always breaks next to the stiffener ribs.
Google torque converter, there are go-kart suppliers who have TC's with aircraft aluminum plate.
Some even sell just the mounting plate. They are somewhat more expensive but they won't break.
A buddy of mine has had three mounting plates break.
There is a casting flaw called a knit line that was evident in each one.