I bought #415 chain from Fulton Heights Mower Sales a couple years ago, but they don't seem to know what 415 is anymore. Now they just tell you to bring in your old chain so they can match it up. I would also recommend taking the sprocket with you to make sure the new chain seats well with it. Don't want to risk having one of the dimensions being slightly off, be it pitch, roller width, roller diameter, or pin diameter. Tensile strength shouldn't be as much of an issue unless you weigh 300+ pounds, or always riding with a passenger, or if it's a torque monster.
The gold drive chain from TreatsHQ is hella strong and pre-lubed. Worth the price.