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https://www.pletscher.ch/index.php/en/products-en/fenders-en/fender-mounts-en
It's English here, but the description for the mounts only mentions r50 and r60.
The description for the r80 fenders says it can use the mount.
I haven't mounted them yet. The pic was taken on 2.8 tyre. They are made of plastic so there is some scope to play with a heat gun...