The 13250 is a Hitachi Alternator for 1990-89 Pulsar / Sentra. Lester Issued This Part Number for Two Different OEM Numbers - Hitachi LR165-707B and LR170-738B. Although There is a Slight Difference in the Distance Between the Bottom Mounting Hole and the Center of the Pulley (5mm Less For the LR170-738B), it Was Thought They Should Interchange. Many Claim They Will Not. The LR170-738B Is Now Referred to as the 13334 (Supersedes the CPC 13250A). The 13251 is a Mitsubishi Unit Which Interchanges With the 13250.