will the LSD out of a M2B4 tranny work together with the M2P4 tranny??

and my other question is what the hell is this i never run into something like that in my life........... how does it work ???

FF DYNAMICS LSD LIMITED SLIP DIFF H22 H22A INTEGRA RSX - eBay (item 300276535022 end time Mar-16-11 11:56:19 PDT)

any info is good thanks