CJ, You know of course that the originals were 18 inch 03 bayonets, right ?
Pacific generally used full length since the Japs used an 18 inch or so bayo on the Arisaka.
Troops in Europe got the cut down ones that matched the length of the German Bayo's.
Bayonets are generally crap, they are meant to be multi purpose so they don't do anything well.
Unless you are restoring a collector arm they are a waste of money.