Okay, I guess you're a button counter then. Nothing wrong with that in my book. To my untrained eye the first few marks all look the same, nose-wise. The mk III and III* are the ones that were largely used in the Great War, as far as I'm aware (though honestly I'm not very aware at all when it comes to guns).
My head spins with Lee-Enfields, anyway. What with the MLE, the LEC, CLLE, SMLE mk I, II,III, III*, V, Rifle No.1 mk VI, Rifle no.4, 5 and.... Oh hell, that's where my tired and wonky brain gives up and I throw my hands in the air.
But I get you. You want the Great War one with the shorter nose, rather than the 1930s-40s+ one. Not sure I've seen any of those separately available. But then, I haven't looked...