How to find CART_ID for a physical copy of 3DS game using PowerSaves?

Hi everyone,

Basically, my question is just the title of this thread. I have a Sky3DS+ V112, and the latest firmware for N3DSXL (I think it's 10.6 US?)

How can I find the CART_ID for the game that I'm plugging into my PowerSaves to go about playing online with the SKy3DS+? I was able to get the header, but I don't know where to find the CART_ID... If it helps, it's for Animal Crossing New Leaf.

Thanks!