If all else fails,you could try EECO ( exhaust ejector company)
Google eeco or www.eeco.co.uk.
They can make you a window from scratch,taking a pattern from a damaged window.I would stress that this is not a cheap option,but it can be reliable,if or when all else fails. I had to use eeco for a caravan front window and the process worked.
EECO are friendly & straightforward to deal with. Sometimes you get fed up with chasing breakers & getting no sense, which is what happened to me.
Sometimes you will find that when you have wasted hours on dead end leads, the re-manufactured option makes more sense. You could try checking ebay on the off chance.