Dana 60 info needed
As was stated the truck rears don't have provisions for the pinion snubber. They also have much thicker axle tubes than the race or passenger car rears have. Other than that I would check to make sure it hasn't spun a carrier bearing in the housing before I bought it or at least get an OK that if it has you can return it and get another one.
Having said that have you checked the Strange Engineering S60 or the Moser? You can buy them as bolt ins for leaf spring cars and they have the snubber provisions.