What 10 bolt do you have? Is it GM, Ford? What is the gear ratio? What is it in?
There are many limited slip differentials (posi) that you can buy to install in just about every rear end out there. You must have some information on the rear end before you can order anything. Things like gear ratio and axle splines are very important. You also need to know what the car will be used for so that you can choose the right one for the job. There are clutch type, gear type, lockers and other types of differentials that work well in certain applications, but not so good inothers.