I checked and the part numbers for the Sportage front R&P and the Miata rear R&P are the same except for the gear ratio. The part numbers for the Sportage rear R&P and the rear RX7 are the same except for the gear ratio. The guy and the Mazda dealer didn't want to help me anymore after I told him why I was checking this out so I couldn't get any info one the limited slips.
Dennis

95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.