I would like to move my stem down a spacer or two, but in my search to confirm the spacers may go on top, I found they make a "top spacer" and now I'm unsure. On my SystemSix, I use a round spacer on top, but unlike that bike, the top cap for the grail seems to match the spacer (at least to a large degree).
Canyon Grail Top Spacer: https://www.canyon.com/en-us/canyon-grail-top-spacer/164709.html
by the_diesel_dad