basically buy it kinda deal
you can either cut the cover or get a new fog light cover then get a round fog light... its a hit or miss kinda thing... the reason i like the oem is because it fits nice so no dirt will go in... and you can buy the switch that replace your turn signal lever to the one with the switch on it...
or just cut the cover then bondo the fog light to the trim them add a black rubber sealant to cover the bondo act as a barrier then wire it up to the driver side then put a little toggle switch
hahahaha i havent done this its just an idea 
or just cut the cover then bondo the fog light to the trim them add a black rubber sealant to cover the bondo act as a barrier then wire it up to the driver side then put a little toggle switch