Welcome to the Pennsylvania Chapter of FTE . You could contact DiscountPowerPrts, they are in the Pittsburgh area and are members of the Pennsylvania Chapter and site sponsers. Go up to the grey bar at top and click on shop, when it drops down you will see sponsers, click on that and look up DiscountPowerPrts. They should also have a link to their web site and a number to contact them.
While your here why don't you join in the fun that is the Pennsylvania Chapter. Go to the Pennsylvania Sign Up thread in the Pennsylvania Chapter forum and follow the instructions posted.
I'd get a Power lock. I had a True trac. It lasted less than 100 miles, let out a big bang & that was it. They also don't perform like a clutch style locker, you have to feather the gas or mess with the brakes to get it to lock up. I was not impressed.