I finally found a saucer (I'd had the corresponding plant trough for a long time, but it didn't need a saucer until now) - and the order to the store also worked out well (unfortunately there was nowhere to buy it directly). The only drawback is that the same product costs around a quarter less at another DIY store.
for another variant: 73.0 cm 33.0 cm 4.7 cm, Anthrazit
Brunau branch under renovation, it was difficult to find the underground sales outlet.
for another variant: 91.0 cm 37.0 cm 5.9 cm, Anthrazit
Fit perfectly with the Deroma 100cm pots. I am curious to see how they will survive the first gardening season outside (weather etc...)