I bought a tranny a while back for my gsr,it was put together with parts laying around not sure what casing it has but for some reason the gsr halfshaft I bought does not fit in the tranny ,when I took out the seal from the tranny it looks like its 1/4 to half inch smaller than my haft shaft in thickness so it does not fit in.Anyone have any idea what halfshaft I need?I thought all b series is the same

 

I thought they were too, you might have a d-series shaft.