The two framing stone (side pieces) of the spa spillway connecting to my pool fell off. I want to replace with new ones. I'm honestly not sure where to go to look for replacements. It appears to be a natural stone, size 3x12" roughly. Pool deck is continual flagstone pavers. I'm in central NJ. Pool tile store I called said wholesalers, only work with installers. Where do people go to buy? Local big box stores don't seem to have anything useful.