Have you tried the sealant route first?
When I had mine done quite a few years ago, I simply took it to ‘National Windscreens ‘ who have a depot in Bath and they ordered the rubber seal, which I think only took 7-10 days to arrive .
At the time they stated a disclaimer about the risk of breaking the windscreen and that would be my risk.
Given that quite a few more years have elapsed, perhaps it would be more risky now.
I had a problem from perhaps a year or so old, which led to me being in dispute with Brownhills and Hymer had to intervene and tell them ‘to get on with it’. Brownhills made a half hearted attempt to put a bit of sealant into the top corner, which didn’t work and soon leaked again after a few months.
That’s when I first went to National Windscreens and they did a better job of putting sealant in that lasted perhaps over a year – and then we decided to try the new rubber seal route.
Luckily there was no problem with the windscreen and it has not leaked since (fingers crossed).
They did make the comment that the fit between the glass fibre bodywork and the windscreen could have been a better match and that would not have helped if sufficient care was not taken originally.
True or not ? They used adequate sealant to produce a good seal.
I believe that Russel also had this done and also mentioned the sealant.
I know that our wonderful ‘web master’ Barry had a new windscreen fitted a couple of years ago and I think that he had that done by Auto glass.
best wishes, Fred