TOPS™ 2-Post Add On (Home Line)BUILD TODAY EASILY EXPAND TOMORROW The TOPS 2 Post Add On Kit makes it easy to grow your existing pergola into a larger, more dynamic layout. Whether youre extending a side, creating an L shape, or building toward a full wraparound design this kit gives you the flexibility to build your way. With two Tri Top connectors, two Add Ons, and two Post Bases, youll have everything you need to add two additional vertical posts and expand in any direction.