Another sources question

Can someone please help me figure this out? I've had to reinstall nethunter multiple times and just can't get it to update properly.

I'm using Nexus 7 2013. Out of the box the update (apt-get update && apt-get upgrade) doesn't work. I edited the sources.list file with nano.

Originally it looks like this: deb http://http.kali.org/kali sana main contrib non-free
deb-src http://security.kali.org/kali sana/updates main contrib non-free

This causes packages to not be found when trying to add new metapackages with the Nethunter app or when trying to manually update the nethunter.

I've seen people use "old" or "repo" in place of the http & security. I've also seen people recommend putting "kali-current" after the url.
I removed the Nethunter app that came with my iso and reinstalled the 2019.1. The app still cannot successfully install metapackages. So I'm assuming the app uses the sources.list too.

What should my sources list be?

Thank you!