I'm installing a lockright in the rear axle of my samurai

we've got the differential torn down and everythings pretty much ready to go back together except for this part, the block holding the spider gear shafts in place.
the installation manual calls it the axleshaft thrust block and one of the four outer holes on it has been stretched or something cause it feels real loose.
And this brings me to my question, where can I find one of these? We've looked all over town and no one has them, I looke to see what it would cost from the factory and its like 36 bucks, which seems like alot for a little block of metal. Does anyone know where I can find one of these for less? If not I guess I'll just have to spend the $.