Les - having some of every year out back, I know the 57 alone has the 'wind splits', other than that they're the same, and Josh said in his post he likes that feature on the 57 .... so as to his question if the GMC hood would "fit", the answer is all 55-57 hoods are the same

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot