This has always boggled me. Are the s5t2 and s5n/a omp the same? What spark this question was this comment I seen on ebay"MAZDA RX7 1991 TURBO J-SPEC OIL METERING PUMP WITH LINES FROM A LOW MILEAGE MOTOR.CAN BE USED ON N/A RX7S ALSO 1989-1991" Whats the verdict guys?