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I would use 20mm bolts if that is what was in there before. Just get any good quality bolt, doesn't have to be from porsche. You are putting a steel bolt into aluminum threads, so you want as long a bolt as possible to help avoid stripping the aluminum threads.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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