E30 Zone

Anyone know of a place to buy the correct color coded wiring? I am replacing the fuel pump wire from the fuse box to the fuel pump and would prefer not to use off the shelf solid colored wire. I can cut it out of another car but it would be too short to run the length so would require splicing it in, which is what I am trying to alleviate as right now there are two splices which are giving me issues and I've ran out of wire to splice.

it's green/purple.