Some additional information . . . I received this e-mail from Stephan in response to a couple of questions I had for him . . . (Not edited for clarity because I didn't want to alter his e-mail content. You'll get the message)
Hi Bob,
I know the US Diffusors. There not fine, and with Shipping and Tax to much expensive in this Quality.
This is the Reason why i build my own Version. (I own 3 Crossfires maybee in next Time 4 [IMG]aoladp://MA36522-0001/wlEmoticon-winkingsmile[1].png[/IMG])
I want a Diffusor that looks Like the stock Mopar Diffusor. Also the grained surface.
I do the outer mold from a New stock Mopar Diffusor.
The first Set looks very good, but do not fit Perfekt.
Then i do a secont mold with the help from a cut out assembly area out of a stock rear Bumper.
This is the Reason why they fit Perfektly.
I use black Gelcoat also the Diffusors yet paint in flat black. They look perfekt stock.
I'm currently working with Stephan to get update pricing information on being able to place individual orders with him and getting the diffusers shipped directly to our buyers in the USA or CANADA. I'm doing this because in answer to a follow up question I discovered that shipping 20 sets directly to me was quoted as a BULK shipment (sets not individually packaged) so upon receipt I would have to repackage everything to ship them to buyers. Accordingly, there may be a minor adjustment in the pricing of post #1 but you will receive your order / product shipped directly from Germany.
Also, I have joined the German Crossfire website but have not yet been "approved" to access everything there. These are a couple of posts that I could immediately access and here are some comments from Crossfire owners that have already received these German made rear diffuser kits (translated from the German Crossfire website page by Google Translate). I will update this thread with more information and photos as soon as I get "approved" 
. . . I hope they don't run a complete background check on me . . . 
Hi Stephen,
mine are also arrived and look great.
If they fit the way they look, you can not complain. You will definitely see better than the fiberglass replicas of the US, which I definitely can say.
Thank you again!
VG
Hans-Peter
Hi Stephen,
I also am the proud owner.
What amazed me is the perfect fit and the quality, just hammer. I can only recommend. The cultivation is simple, holes, drill, assemble.
Thank you.
Greeting from Switzerland
Roger
More to follow . . .