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I don’t have the exact info you are seeking, but I went through a similar exercise a few years ago with a Bosch fuel pump out of an older Mercedes, which is similar in design to the ones in Porsches . No rebuild kits were available. I took apart the pump, measured the orings, and ordered some from McMaster Carr. And voila, I had a leak free pump again.
I’m pretty sure there are threads on here about rebuilding the early Bosch pumps, you may find more specific info there.
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