Rational fastening full extension

Hello community,

I dismantled my tall cabinet with full extension 4 years ago and now want to sell the "innards." Unfortunately, I'm struggling with the two rearmost drawers and the bracket that is attached to the pull-out front. It's probably an older system (bought in 2006) and I can't find any descriptions anymore :rolleyes:

Does anyone have any advice?

Here are the pictures:

Thank you

But you have already taken it apart quite far.
[MEDIA=youtube]Urq_X-mGZWI[/MEDIA]
shows how it should have been done.

Regards,
IKEA-Friend