So, even though the front half of the tank is plastic, the magnets hold good?
The magnet of the tank bag is strong.
Maybe, I think that it is installed in the tank with four magnets among six magnets.
It is written, "○" in the list
of the manufacturer.
It is interpreted that the tank bag can be installed in the tank with the magnet.
※タンク(Japanese): Tank, 吸盤(Japanese): Sucker
However, because I don’t know your usage condition, I cannot say, "There is no problem".
Please judge whether it is suitable for your motorcycle by yourself.
I love Kobe. Voyage to the future