Go to a wrecker and cut out the part of the loom you need and go from there. Stagger the joints and shrink sleeve them. Should look original if you are any good. BTW I understood the 'Cheap' reply was refering to the job price not the poster.
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?