S15 open diff an a 'supposed vlsd' diff

[jimlad5]

Have a open diff in my s15 ATM bought a supposed vlsd diff from an s15 but doesn't bolt up so taking it that it's not an s15 diff? Here's a pic.

http://imageshack.com/a/img746/9230/nddEuW.jpg
The mounting points on front are different and back plate is different? Got sensor tho :/? The distance on the prop shaft joiner is longer on my 15 diff also.
Anyone got any info on what it's from? Or any way I can put the LSD into my casing or anything? The shaft outputs are the same

[Actual_Ben_Taylor]

Couldn't see the picture...

[jimlad5]

Yeah car was a spec s, so how'd I go about getting it in then? I need the subframe and different front mount bushes or sumit?

[Actual_Ben_Taylor]

Oops sorry, pic was too small...

One on the right is from an S13, just swap all the bolt on bits over and use some different bolts for the front.

[jimlad5]

Dint think s13s used a sensor on front though :/? Weird

[peteman35]

You should have just bought a S14 Vlsd. Im pretty sure S15's didnt come with Vlsd's only open and helical.