Multiple listings for the same brand and type of part merely indicate different suppliers. Unless otherwise noted, they are the same part.

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Rubber O-ring - Genuine Porsche

G99970734840

Known as: o-ring / o-ring 42 x 4 / o-ring 42 x 4 use also:

$7.59
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Victor Reinz Rubber O-ring - New/Replacement

R99970734840

Victor Reinz Rubber O-ring for Porsche 911, Boxster, Cayman

$2.92
QTY: 

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Victor Reinz Oil Filler Tube Seal - New/Replacement

S99970734840

Victor Reinz Oil Filler Tube Seal for Porsche 911, Boxster, Cayman

$2.75
QTY: 

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Rubber O-ring For Oil Filler Pipe - New/Replacement

T99970734840

This part is no longer available.