Bike Bandit Help

Alright, I have a ruptured diaphragm in my carburetor of my 98' yz400f. Looking on bikebandit.com there are four choices to choose from. 3 of the say API and are each different prices. The other says STD which im assuming means standard. Which of these would you get? Yours answers are appreciated.

Here is the link.

http://www.bikebandit.com/houseofmotorcycles/1998-yamaha-yz400fk/o/m8897#sch113137

Here's the PN: 5JG-14940-18-00

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