Considering you'd got 193,000 out of the original diff,if they can find you a lower milege diff then what you had,you're still ahead of the game.You were considering a diff with 150,000 miles on it last friday,lol. If they end up finding you a used diff,insist they throw new axle seals in it,you could push for a new pinion seal,but to properly replace the pinion seal,they should also replace the crush sleeve,and then reset the pinion turning torque,but that entails pulling the carrier out,and they might not want to do that