Try the Daimler Dealers in you area. I found one in my area that will cross reference the part numbers [if needed] to the SKL. I have found the Daimler parts to be over 40% cheaper and they have a better chance of having the parts in stock. The Damiler will offer advice but will not work on the Crossfire.

You can also try on line: as some owners have removed the system and might be willing to sell the un-needed parts. I believe the aforementioned referenced system is a pollution control system which injects additional air to the cad converter to warm it up quicker during a cold engine start-up and then the system shuts off.

Good Luck
KK