I recently purchased part #7775K from iPd and noticed that the O-Ring is different than the one the dealer gave me. The one the dealer gave me is about 2.5cm outside edge to outside edge and is green like the picture on their website. What iPd gave me was orange and about 2cm outside edge to outside edge. I guess what I am asking is which one is the right part? Here is a pic attached. Tech, you are bound to be more than helpful on this. Thanks in advance.

EDIT: I am sure you can tell, but the set on the left is from the dealer and the set on the right is from iPd. Both have the part number 3514546.

 

The orange one on the right looks like a dipstick tube o-ring.