New Genuine Nissan Silvia S13 Engine Rear Main Oil Seal Retainer. This is the correct factory retainer found on all SR20 motors This cast aluminum unit holds the rear main oil seal and provides reinforcement to that seal against the engine block. If you are rebuilding your engine or replacing a leaky rear main seal, this unit should be replaced in order to keep the proper seal alignment against your crankshaft and block.
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