I had a good local locksmith make me a spare key and he too said his blank was too short, but he made me a key. After trying it, I cut about 3/16th of an inch off the part you hold of the key, trying to make it go deeper into the lock. No luck in the ignition, but it did work to unlock the seat.
I asked my dealer to get the proper blank and when I returned a week later,being in my truck, I forgot my original bike key and the parts guy said the key he ordered for my bike, a blank, was the same length as all his other blanks. Haven't yet returned with my original key to see "vas es los." HB