Differential swap
 

Hello,
I am looking for a limited slip differential to install it to my W115 230.4 1975.
I heard from a mechanic that the 116 would be a suitable part source.Actually I searched all the local junkyards and I found one at about 400$ .
Can somebody tell me if has done this swap or if it is going to fit?
I also appreciate some info about the 116 limited slip differential, like the percentage of blocking etc...
I ve looked allover and nothing I found.
Any ideas and suggestions are welcome.