As far as I know you cannot get a 43ft fibre glass pole at the moment.
We will soon be stocking Exel's new X-tel range, which may have longer fibre glass poles but I cannot say for sure.
I would not recommend using any fibre glass pole at 43ft due to rigidity and weight issues.
If you want a compromise then Omnipole are selling off the old Exel 45ft Carbon fibre Universals at very cheap prices, these are still quite heavy by modern standards and due to being in 8ft sections are difficult to use (I know I had one 6 years ago!). They come with a fibre glass base section for insulation. They are a cheap way of getting to 45ft but are not user friendly as very hard to adjust length whilst in use.
My recommendation to anyone working at 43ft would have to be a Super-Lite but then I would say that wouldn't I
I use these at this height all the time and they are very easy to use.