Cusco LSD Problem

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Recently I bought a second hand Cusco One Way LSD for my 1994 S13 200SX (ca18det) with open diff car.I guess it's a very old product but it was in mint condition and I made my decision and bought it.The lsd also has its own box, and on the box it says that "Only for S13 with J's and Q's) . My car is J's editionand it should be ok with it. But when we tried to install the LSD there's a problem occured. Which is;the drive shaft inputs of my car's thickness is 33m, however the Cusco's holes are 29 mm. and the drive shaft axles won'tfit into the LSD. I want to learn that if there's another version of my car, because the box says that I need no extramodification but I couldn't install the axles. What am I suppossed to do with the diff ? Should I buy new drive shafts andif I had to, what's the correct drive shafts for me ? I hope I can get a true answer for my problem.