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While some, rare R17s use the 365 box, Lotus fit their own fifth gear. AFAIK the Lotus fifth gear parts are now unobtainium. Most of the Renault transaxles leak a small amount of oil, slowly dropping their oil level over time. Fifth gear is tucked way at the back of the tranny and is usually the first to suffer when the oil level falls. It's very important to check fifth gear's condition when buying a used transaxle (that and chipped ring gear teeth).