I know this doesn't answer your question. Just my input on the ties.
I have used several different sources (in the US) for John Bull rubber ties over the decades. I haven't yet found a source that holds up more than just a few years.
Appreciate what you're saying Gary but what would you use?
I'm loath to use nylon tie wraps even though I have an abundant supply of them to hand. I've used them in the past and they have ended up damaging the paintwork after some time on the bike and they also just don't look right to me on a classic motorcycle.
That may sound a little irrational to some but I work as a Controls Engineer on automated machinery and I'm used to seeing the electricians use tie wraps on cable management systems and to my mind that's where they belong and where they look right. Anywhere else and they always seem like a bit of a bodge to me.