Vlsd to welded diff output shaft question

[pcrossley93]

Hello, I have a 91 240sx, it was originally a hicas model, the guy I bought it from told me it had a LSD in it but I never asked if it was the vlsd or not. The diff cover says viscuous limited slip but I am not sure if it is the same vlsd that came with the vlsd 240's. I recently purchased a welded diff from somebody on zilvia and the half shafts seem to not be compatible. Also they are the type of output shafts that are two different sizes.

http://imageshack.us/photo/my-images/685/49317096.jpg/

That is as far as the output shafts will go and obviously does not seem to be compatible. not the one on the left is poking out especially far.

http://imageshack.us/photo/my-images/163/77422588.jpg/

I feel like what I need to buy is output shafts from a open differential s13, if anybody could provide further insight I would appreciate the help. thanks