You seem to have a custom piece.... or maybe not all parts are from D2.

Couple of weird things...

How "thick" is the slanted "vertical" railing? Mine is only 1 3/4" from back to front. Your piece looks much thicker.
See you have two pieces of "tabs" with screw with nothing attached? The aluminum bar with brass rods go there, not where it is now.
The bottom piece looks to have something attached it to move it forward.

Compare yours closely with mine and see the difference.

I won't be surprised there were some versions during the LooooooooooooooooNG time Omega produced these but it looks like yours have been customized.