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Try searching Bacci Romano I think that's the name they do Group N and group A gear kits for the JC5, I 've been searching but don't have the details to hand.
Dave mac propshafts will put you on to a guy called Tom who makes gripper.... its £2200 for the dog gearkit,£550 for new cwp and £850 for diff. Hope this helps! Also various ratios available iirc