The technical name for the piece that runs between the front fenders that the grill bolts onto and ties the front sheet metal pieces together eludes me....
But I'd look for one while looking for fenders as the 'fit' at the top where they met could well be different, IDNK from experience just a heads up of likely area of concern.
If there was an issue you could easily make your own patch panels and weld them into the 56 if need be.
