How to get linux headers or source code for debian 8.0 kernel 3.16.0-4-amd64 ?

["Kiyanovski, Arthur" <akiyano@amazon.com>]

Hi,

TL;DR - How do I get the Linux headers or source code for kernel 3.16.0-4-amd64 Debian 8.0?

What I tried and failed doing:
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I have an AWS instance with kernel:
3.16.0-4-amd64

apt-cache search doesn’t find a relevant package.

I tried updating the etc/apt/sources.list file with the archive so it now looks like this:

deb http://cloudfront.debian.net/debian jessie main
deb-src http://cloudfront.debian.net/debian jessie main
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main
deb http://cloudfront.debian.net/debian jessie-updates main
deb-src http://cloudfront.debian.net/debian jessie-updates main
deb http://archive.debian.org/debian jessie main contrib non-free
deb-src http://archive.debian.org/debian jessie main contrib non-free

At first running apt-get update gave me an error 
W: GPG error: http://archive.debian.org jessie Release: The following signatures were invalid: KEYEXPIRED 1587841717

Then I used the solution of going back in time described in https://www.reddit.com/r/debian/comments/g9is3p/debian_8_jessie_keyexpired_drive_my_crazy/:
date 010100002020; [apt-get update / upgrade / whatever]; ntpdate 2.pool.ntp.org

This stopped the GPG error but I still don’t see the headers package.

I tried getting the sources for the Linux-image package like this:
sudo apt-get source linux-image-3.16.0-4-amd64

But it got the sources for kernel linux-3.16.84 and not 3.16.0-4

Can you please help me? I need to make sure my code compiles on this kernel but I can't get its sources or headers ☹

Thanks!
Arthur