Yesterday my shop told me that on next Monday the new wing will be shipped. Good news so far. The insurance had sent an evaluator to the shop in March to examine my car and they will pay up to 1000€ retention after all. The high deductible that my insurance only requires for a Morgan is explained by the fact that so many windscreens had to be replaced a few years ago, and that even minor sheet metal damage can quickly become expensive. Anyway now the repair can start.