The OEM fuse box has been known to be problematic at times !!
Here in the US, these ceramic fuses are not very common, auto parts stores like NAPA have them and I see them on occasion in the national chain type national auto parts stores .
Fuel stations here in the US normally don't stock auto parts just a convenience store for snacks, beer, etc .
Depending on how you want to go, you can remove the OEM box and splice in two fuse holders with the more common blade type fuses .