You can easily start a new thread so that your subject can be found easily later
But, in answer to your question - it really depends on condition and where you are buying.
The diecast parts of the FC grille pitt readily so this brings the value down. Also the botom bar is often dented and / or rusted which also effects cost.
Ebay is usually the dearest place to buy parts from.
Sooooo - a grille with pitting & poor bottom bar would be worth maybe $20 to $30
and a grille with no pitting & good bottom bar on ebay may bring $200 to $250 or even more if it had NOS parts in it.
Ken