While it is certainly worth the effort to try and see if they have one, the problem is, that is just one of many Dealer that just sells Dealer Parts online at a discount. The parts come from the same system as the Dealer telling the O.P. that it is out of stock and won't be in till Sept. So don't get your hopes up to high, likely they will tell you they can't get the part just like the dealer in your area is saying they can't get the part.
Have you tried junkyards from that do internet orders or mail order?
As well, the dealer that performed this work, the vehicle is still apart and they can't put it back together until you get the part sometime in Sept? I'd be calling or writing Chrysler Customer Service about this dealer and situation. Even if it is NOT the dealers fault, Chrysler should get put on report for its failure to keep necessary parts in supply. Perhaps with some complaining they will be able to shake a part out of the trees for you.
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