Actually, you only have to make sure that you buy the correct one - if it should be the one that fits the "Thule Dynamic L" as you wrote, then it would be the one with the item number 9868991. You just have to make sure that you don't click on something else in the "Size" field, otherwise it will jump to another product with a different item number. I hope I was able to help.

Just found out that it is for the "Thule Dynamic L ". Do I have to make a special note when ordering so that the cover fits? In the description it says that there are 4 sizes. Thanks for the info.