There is now a comparatively easy way to order many Bavaria spare parts: https://www.bavariaplus.de/en/s/teaser
The process is a bit complicated: First you go to the website, try to find the pieces you need, put them on a list, send the list to a dealer to get a quote. But the german chandler SVB has all the parts also in his online shop in the section Boats / Leisure -> Bavaria+ (https://www.svb24.com/en/category/boats-leisure.html).