new axles

i've put a 200tdi engine into a 1989 2.5td '90,now i want to put some axles off a 1992 discovery on but the disco callipers have 2 pipes giong into them and the '90 axles only have 1.
what do i have to change(callipers on the diso axles or part of the '90s brake system)or will the '90 brake system be ok.
cheers for any advice

you appear to have ABS or dual circuit brakes on the new axles. You sould be able to change the caliper, but i may be mistaken.