I need a mold or ideas

There’s a mold on Etsy, but it’s probably too small for your needs. Try different Google searches, you might be able to find and purchase your own.

https://www.etsy.com/listing/70449112/scales-of-justice-flexible-mold-push?ref=sr_gallery_8&ga_search_type=all&ga_includes0=materials&ga_search_query=resin+mold+polymer+clay&ga_ref=related&ga_page=1&ga_view_type=gallery

If there’s not a bakery near you that can do it, another option might be to do a flat silhouette style piece cut out from chocolate.

http://m.ebay.com/itm/LEGAL-SET-GAVEL-AND-SCALES-OF-JUSTICE-CHOCOLATE-MOULD-/360338000406

I think it would be much easier and more memorable if you bought a figurine out of something different than chocolate such as something like this

http://www.amazon.com/gp/aw/d/B00354W96G?cache=0c08bec01b9b7347adf5b64509ac9a2d#immersive_view?1393814872312

Sorry it wouldn’t let me paste it in my last post..
Anyways I think this would be very pretty on top of a cake