[SMITH23H2SUT]

I'm about to install my third L.E.D tailgate light bar and I need help. The problem is it is about 1 1/2 inch too wide on each side. In the past I've trimmed each side and used silicone to try and seal the ends to waterproof it, but moisture always gets through after about a year causing me to replace it again. Does anyone know of a better way of sealing the ends after the trim down? It has turn signals,brake,parking, and reverse white L.E.Ds and the look is BADA55 when installed but I'm getting tired of constantly changing it yearly. Any suggestions on sealing the ends? It looks like they're only available in 50 and 60 inch and 50 inch is too narrow.