They are not difficult to put together yourself and make the far better than the originals. There are 8 wires  - 2 for the coil, 2 for each opto tx/rx and 2 for the  lamp. A bit of heatshrink or cable mesh covers for the wires, some connectors and you are done. You can re-use the old connectors if you don;t have any on hand and I've even seen 4 pair Telecom cable used in a pinch.