If the grill is that much bigger my guess it is from a 1-1/2 ton or bigger truck since that is about the difference in size. 3/4-ton grills are the same as the 1/2-ton.
Those bright surrounds polish up like new and really set off a truck cab in my opinion.
http://www.flickr.com/photos/advance-design_parts_co/8129179541/in/set-72157631867396207

1950 Chevrolet 3/4-Ton 3600
More pictures on Flickr