I had a bit of back and forth until I've found the one that suits the synth, Roland JD-Xa. Given that, unfortunately, Thomann does not sell the original accessory. However, this Rockbag gigbag is more affordable than the Roland one and can fit the synth, length dimension is tight, but the synth can enter without forcing the zipper. The Height of the case is a big oversized for this synth however I recomend getting 2x 392342 Foam panels for protecting the knobs and sliders and increase the padding.
The gigbag and the padding is okay for casual gigging, but I will assume that if you want to travel overseas or long distances by car, you might want to get a sturdy flightcase.