I’d just make your own. I did and got rid of loads of redundant wires, reduced the number of connectors and moved the switchgear connectors to inside the headlamp shell. It’s not a difficult job and is a bit improvement over the original especially under the tank where I now don’t have a great lump of bullet connectors.
Most of our bikes are now over 50 years old. So complaining about rubber bullets that have persisted etc (as some seem to delight in doing) is a bit daft really. A good quality, well made, well fitted, new standard harness will likely give another 50 years good service in reality. So there’s nowt ‘wrong‘ with doing that really.
But… we should remember a few things like:
1. They were mass produced, to a price.
2. They were practically a ‘one size fits all’ for a very wide range of applications, leading to compromises and redundancy.
3. The availability and quality of components and tools for the DIY market is light years ahead of what it was then.
4. Most bikes have been modified in some way, requiring modification to the wiring plans.
So… when all of the above is taken into consideration, it’s pretty obvious that there is much opportunity to do a better job than fitting an aftermarket standard loom.
IF one has the aptitude for the task that is.