Shouldnt be an issue with LHD or RHD, I would suggest that the rack boots from a Mercury Capri ( US continent version of English Capri, circa late 1960's onward- Not repaneled small mustang ).
Check dias of Rack housing @ both ends ( often different fronm side to side) and outer arms ( these should be about 1/2" ). Most good brake & steering shops have cross reference charts to help track down this stuff.