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I'm currently in the throws of upgrading my IRS, including putting new seals on the rear diff. Thought for the general purpose of info I'd show a pic of the inside of the rear alloy diff cover which was special to the XJR-S. I don't have a standard pic to compare against though. I understand the ribs were designed to limit oil movement away from the gears during hard cornering. More pics to follow once the upgrade is complete.