Bedifferent: No problem! You are definitely vindicated. I think I'm first going to call my Triumph dealer and ask what a Triumph blank would cost. If my heart doesn't stop when they tell me the price, I may just order it from them because I think you mentioned that the profile of your Ilco wasn't exactly the same as the original. If my heart does stop, I'll order the X270.
I'm not happy with the place I ordered the key from (Taylor Lock & Key) because I ordered the key based on the information they had on their site and the fact that, of the keys they listed for Triumphs, the one I ordered was the only one that had the same exact profile (cross section) in the illustration as the original key and even the head was the same shape (but larger and without plastic covering) but the one I received had a completely different cross section and wouldn't fit at all. Their response was basically, "Too bad!" But guess what! They said the correct blank is the Ilco X270!