Hypoid gear ratio 240sx

[ECMotorsports]

Hey i am putting in a Nismo LDS in my 240 and the final step involes the hypoid gear ratio, does anyone know this on the 240?

[ECMotorsports]

nevermind on that last question, the real question is in my kit, it does not come with side flanges. do i reuse the ones on the car? the directions say

other than rs-500-a
do not use the side flanges attached to your vehicle

my kit did not come with new side flanges

my part number is rs 661?

im confused and dont want to F up my diff