Good luck in trying to find OEM parts of any brand car for cars over 10 years old, RockAuto is the way to go been using them for years and I do find shipping cost a bit high sometimes.
I would like to add Ebay is a minefield for chrysler parts - there are dozens of sellers on there listing Chrysler bits but they generally don't hold any stock. All they are doing is ordering from RockAuto or Alibaba and re-boxing them when they arrive. If you use Ebay (which I did for pistons and valves), pick a US seller. If I had twigged about RockAuto before I bought pistons/valves from Ebay I would never have done it.
I have been buying trim parts and missing interior stuff from "Fenns 300C parts" on ebay - he is based in the UK but ships quickly. The great thing about him is that he is a quarter of the price of local Australian wreckers, who for some bizarre reason think a 17 year old Chrysler 300C is some kind of mega expensive luxury vehicle like a Ferrari and charge accordingly. Of the few times I have priced spares locally I have recoiled in horror (looking at you Jeeeparts, you can stick your prices up your jumper).
As Lou has found out, what is left of Chrysler Australia have no stock of anything. I understand they don't want to hold a pile of expensive stuff for Chryslers but they could at least stock engine parts that are shared across jeep/dodge etc. They do not.