Sorry I’ve only just seen your message now as we are away for the weekend, I do have some parts but not the ones you have mentioned.
I ended up finding a used screen from another forum member. I tried a few windscreen fitters but none of their suppliers listed UMM screens. I could have had one cut from laminated plant machinery glass but it wouldn’t have been safe for road use. The next option was to find a flat lorry screen that they could cut down to fit.
Let me know if you need any other parts as I still have quite a few smaller parts.