I replaced the master cylinder with one from an xr3i, 23mm
took all the brake lines from said xr3i. removed everything to do with the brakes on the rst line wise and the compensators and the abs modulators.
then literally put all the new lines in, in exactly the same way as they were on the xr3i with the modulators in the front wing on the drivers side.

ask safe chav or someone like that as i'm probably not very clear to anyone else but myself

sorry if it isnt much use but its a fairly simple swap and thats coming from someone who isnt confident!!!