They are no longer available as an original part. They came in two sections; a lower rectangular panel and a top part with cushioning to go on the top part just below the window. You could easily make the bottom part but top part more fiddly. Best to go for replacement trim from Exmoor. I'VE got them with handles which are also rare but to be honest I not that fussed about them. Suppose they help warmth.
 

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