vectrix battery charger

I sent some pics of my battery charger which I have dismantled from a scooter I purchased for spare parts recently and found that the same component that failed in my first scooter also failed in this one. I think it is a 20mm radial varister but I cannot read the part number on the side of it? Does anyone have a photo or know what I should order as a replacement? I know it is a long shot and it may still not work if I do replace this part but I thought I might try before the charger goes in the bin