Did you try and get a hold of Perrin? I appreciate you letting the rest of us know about the issue, but I'd give them a chance to fix it first. I am interested to see what they say though.
I know the spacer in the Perrin kit is different from the standard Mocal one (Perrin one is black, and the Mocal one is silver) but I don't see much actual physical difference between the two.
The picture below is the Mocal one. The original poster of the picture did say he was non-plussed about the appearance of the Mocal one though. Link to the original post
here