Greetings all. My brother made a believer out of me when it comes to pellet smokers. I purchased a PB500 and love it. My only gripe is I can’t find a side shelf for it. It has the set up for one but all the shelves I find are for larger units. I have searched everywhere. The distance between the screws is 15.5” Does anyone know where to purchase one or will I have to make my own?