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I can't answer your question on which is best, but I do believe this is one of the areas where you want the "better" Viton (green) O-rings, so they don't get goofed up during installation. The "regular" (red) O-rings are easier to tear.
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Ed Hughes
2015 981 Cayman GTS
6 speed,Racing Yellow
Past:1984 911 Targa (Ruby), 1995 993C2 (Sapphire), 1991 928S4
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