Happy to help!
Also, when putting the cover on it's easier to put the metal part of the key through the center hole first then, pull the silicone around the plastic. You can get the plastic through the bottom hole but boy is it difficult!
The silicone seems to be stretchy but SUPER tough, I don't think you could accidentally break the silicone like you could accidentally break the plastic cover BRP provides.
In the US bimmerzone has free shipping so, while the key cover costs a little more you still save a buck -
http://www.bimmerzone.com/BMW_Accessories_Key_Cover/AMG-BMW-BMWJ33.html
Shipping was very fast! (and the one posted above is the purple) it's not a deep purple but that photo was with my iPhone in the kitchen light so the color isn't totally true to life.