SkidRow Automotive ( skidplates.com ) can do you a RHD one. FWIW, their control arm skid plates will also fit with a bit of grinding on the axle bracket. (I have no connection with them, but have been extremely pleased with their products, and the cost of shipping was cheap - 120 bucks for 110lb of metal).
Dave Milne, Scotland '91 Grand Wagoneer, '99 TJ