I have a pair of Vass lasted shoes trees. They are for the U-Last. Vass uses the same size shoe trees for size 41 and 41.5, so the trees are marked 41. I own multiple 41.5 Vass shoes, so I know that these trees marked 41 come with the 41.5 U-last shoes.
I don't remember how I ended up with an extra pair of shoe trees. Price is $50 including shipping to the CONUS. The pictures are not the actual shoe trees, but the pair I have for sale look exactly the same.