I have a few extra stock mufflers laying around. If you want one, shipping cost would be about $50. I expect that it won't be hard to find one locally in a major urban area though.
Also, I was doing some clean-up this past weekend and found a variety of springs. I haven't found a full matching set, but I still have more junk to sort. (colored paint marks the spring model), but if any of them would be useful, let me know.
Here's a basic explanation of the markings. The color coding can be found for each spring set in the parts catalog (downloadable here:
https://www.porsche.com/usa/accessoriesandservices/classic/genuineparts/originalpartscatalogue/ ).