Here is pictures of a front and rear axle from a FJ60.
And this is from a FJ80 rear axle.
And from what I can see the new 100, and 200 series have all offset rear axles too! Not 100% sure of this, but doing a google search thats what seems to come up. If your looking for a centered up diff, I'd go with a D60. Or call Diamond, or RuffStuff, and get axles made for a centered FJ60 rear axle, and order some Longs for it. That way you can match R&P, and use all factory brakes and stuff for it. My