Nice shocks.
The UE diffs do require special cases though, yes. You have 2 options:
http://www.unlimitedengineering.com/...ore/13551.html
Very difficult to buy, as UE dont sell outside the USA- ebay or seek help from a USA based friend.
http://www.rc-monster.com/proddetail...LM18700&cat=31
Much easier to buy, and does the same job- just replaces the seperate diff cases with cases built into the bulkheads.