i made some up our of old engine oil containers, just stuck em on with gaffer tape and they did the trick, only prob is you also tend to lose a little of the light emmited, i have 2 fog and 2 spots and tbh the fogs dont glare as much but not much light output, the spots are better at distance but flood the bonnet. i used the screws on the side of the light units to hold them firmer at first but they got tore off on a rather scratchy lane , the tape is better. my light bar was aslo mounted right to the very front of the gutter but had been fitted further back at some point asthere were holes in gutter , i moved it back just to try and found this improved things no end but the lights are very close to touching the truck now...still an ongoing trial and error thing, if all else fails i will stick them on to a light bar on the roof, my old paj never had any probs with the light mounted on the roof..
hth andy