If it helps any here are a few pics of my 9.5" diffs from my 89 JDM BJ74, from when I had my ARB's installed. In the side by side comparison pic the painted unit is my original housing and has an ARB RD 124, it is also in the other two shots of the rear axle housing. The unpainted unit has an ARB RD 142 and was purchased complete from
JTs Parts & Accessories, Justdifferentials.com. You can see their is slight differences in the castings.
On a side note, yes it is full floating rear