 I need to replace the gasket in the third brake assembly and Cannot buy just the gasket.Ford sells only the entire light assembly ($65.00)for maybe a $5.00 gasket. If you change the bulbs you need to change the gasket. In my case it leaked inside and now the back sliding window doesn't work. Their way of thinking I would need to just buy a whole new truck. This is my last ford. Never again and I have owned fords for fifty years.