There's a big difference between the 53 and 54 Desoto grills. The 53 has a bunch of teeth bolted to the lower grille pan. The 54 has the teeth on a floating bar with parking lights on the ends.
I found a 53 grille a few weeks ago. One of the teeth is broken and the others are pitted.They're still bolted to the pan. If You want I'll go ask the guy how much. He was talking about putting it on ebay but he's waiting till he gets a digital camera. If you're looking for a 54 I can't help you unless I find two of them.