ABF lambda wiring plus any other wiring help please

Hey,
I'm trying to wire up an ABF into a mk1.  Once plugged onto the engine loom, i've traced the wires back to some plugs that would usually go onto the back of the fuse box, but obviously being in a mk1, this isn't going to happen. So where should i put the 4 wires?
They are    brown     red/white        yellow             white

Please help.

And any other wiring tips would be appreciated.
Thanks