This dealer is like communicating with a girlfriend that has multiple personalities. My prior frustration was caused by this communique:

"Unfortunately our online catalog is unable to specify parts by CHRYSLER, so we go through your order to double check every part before continuing. We are unable to verify parts 100%. IF you are sure that these parts and part numbers are what you need, we can continue with your authorization. This is why we want to double check parts against the VIN. **PLEASE NOTE** If the customer specifies a part that does NOT match the VIN, all sales are final. As in: Customer understands that by accepting this transaction that all ordered parts will be considered non-refundable/non-returnable, no exceptions. This is due to our inability to verify fitment of said parts to the customer's vehicle, and the customer wishing to proceed with the above conditions. - Derek "

You can't just reply to their email. No that would be too easy. You have to log onto their computer system, and yes I mean log on with a password, reference the order number, etc., just to speak to them. Anyway, all is resolved now and so your unstable girlfriend now talks to you as though no spat ever took place:

"THANK YOU FOR YOUR QUICK REPLY... Hello and thank you for your order. If this is your first order with us, we just wanted to let you know that all of our parts are brand new, OEM Mercedes-Benz parts, the same as if you went to your local dealer as we are a dealer ourselves. In regards to your order, we would like to inform you that one or more of your parts was a non-stocking item for us and we had to order it in from our warehouse. Turn around is typically 3-7 business days for us to receive the part(s) and then ship your completed order. If you have any questions please feel free to contact us through our website "Contact Us" link in your order. Thank you for your business, Mercedes Parts Center - Derek"

THE MORAL OF THE STORY IS THIS... YOU DO NOT OWN A CHRYSLER. EVEN THE THOUGHT IS HERESY. YOU OWN A MERCEDES. IN FACT YOU OWN A MERCEDES EXACTLY BEFITTING THE PART NUMBERS IN YOUR ORDER. IF NOT THEN YOU WILL DIVIDE THAT ORDER INTO TWO SMALLER ORDERS EACH FOR THE RESPECTIVE CAR. TO DO OTHERWISE IS TO UPSET THE DELICATE SENSIBILITIES OF Mercedes Parts Center, IE, your crazy girlfriend.