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Many online sellers stock no or few parts. If they are located near one of the big wholesalers they get parts delivered within a couple hours for same day shipping.
I'll throw out a wild guess, no more than 25% of parts sold go to DIY, and when you get into deeper parts that number may drop to more like 10%.
The issue with rebuilt pumps is recent, the iirc USA rebuilder screwed the pooch and started using either cores that were rebuilt too many times or lower quality parts. Maybe its better now, who would like to be the test subject?
I don't know about Porsche, but Motorcraft made a huge media announcement a few years ago with comprehensive warranty terms on parts. The electronic shocks for my Lincoln have failed several times, most recently within a couple months of install when a seal failed and wrecked all the rubber parts under the car. I tried for about a month and found no way to get Motorcraft or Ford to honor the warranty.
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