I have a non-Mopar I've owned for a long time (40 years as of June 20th). It is a car that has virtually no aftermarket support, so I have purchased 2 others over the years and cut them up for parts. I have complete quarters, a complete nose, basically every body panel and even a complete convertible top frame and all the trim. Whenever I came across a part for this car I would buy it and store it. When you "dare to be different" it's part of the deal. To me it's worth it. No '69 Camaro or '57 Chevy for me.
Good luck with your car, and a "tip of the hat" to everyone that goes through the hassles of keeping the rare ones on the road.