I actually have the XenonPro ones (the first on this list you shared) in my fogs but in HID, not LED. They've been working really well so farI think there is no source for just the lens cover. You have to replace the entire lamp assembly. I can also recommend you to install led light. The biggest disadvantage of LED lights is the cost but they worth it. best led lights for cars - here you can read reviews and chose one for your Infiniti JX.