The M1871/87/15 bayonets had the blade shortened to 9 inches and the lower quillion removed. These come up for sale frequently on eBay. The shortened version is correct for the Vetterli-Carcano and is less costly than full-length examples. Shawn Gibson has a couple on his site at http://www.bayonetconnection.com
However, these are a little pricey. Dennis Ottobre doesn't have one posted at the moment, but frequently offers them for sale on his site at http://ebayonet.com/
A M1891 bayonet will not mount to a Vetterli-Carcano rifle. The M1891 bayonet's muzzle ring diameter is too small and the muzzle ring is too high to mount to the Vetterli. Compare the muzzle ring diameters and hilts pictured on the Italy Page of my site
. The differences are significant.
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The bayonet cannot be abolished for the reason, if for no other, that it is the sole and exclusive embodiment of that willpower which, alone, both in war and everyday life, attains its object.—General M. I. Dragomirov