I actually have them in abundance (when I can find them) due to all the Japanese motorcycles I've had, and have.I am surprised that you, a man who owns a DS that isn't one of the earliest, is enthusiastic about 10mm spanners but not 11mm. Most DS owners I know will buy any 11mm spanner they find with a different shape from one they already have. Same for 8mm.
Roger
I don't know that I've used a 10mm on the DS, 8mm definately, not a 10mm though.