Him I forgot I made canvas head light covers with the narrow cut out . just marked a circule in the material cut ou a fraction bigger , cut the slot which a sewed around. Then cut a band of canvas so sewing one edge . This I joined at one point so it will fit around the light post. then I turned every thing inside out , blue tacked the centre round to the light and then stitched it . Once done turn the correct way and you just need to add the tie downs to the bottom were the split is. I had a few goes and found this the best way. only thing is its hand stiched , room for improvment there.
andy