Check the listing for details. GENUINE GM OEM 12337823 Crankshaft Rear Oil Seal Housing SBC Chevy 350, 305. Condition: New other (see details). Listed at 9.95 USD. NEW GENUINE GM ORIGINAL GASKET. NOS original package will go with last one This is a gasket, engine crankshaft oil seal retainer rear, for General Motors automobiles. It fits for General Motors vehicles which were sold in the U.S., Europe, and UK. It's a genuine General Motors part with an OEM part number 12337823. Please keep in mind that this gasket is interchangeable with 12555714 for the U.S. market since November 1, 1996. Part 12337823 Has Been Superseded12555714 is interchangeable with 12555771 since September 1, 2000 for the U.S. market;12337823 is interchangeable with 12555714 since November 1, 1996 for the U.S. market;14101060 is interchangeable with 12337823 since November 1, 1989 for the U.S. market;14088558 was replaced with 14101060 on October 1, 1985 for the U.S. market. ALL RETURNS ARE SUBJECT TO 20% RESTOCKING FEE.