5132-0001: 3-3/4" X 8" making it work well with smaller hooks and jigs and pre-tied leaders and it also allows you to pre load your tackle and be organized when you hit the water. When used with a Plano 2-3715 you'll have a little extra room for your leader spool, swivels, and scissors or whatever you choose. Leader board fits perfectly into the Plano 2-3715 box. 5132-0002: 5 ¾" X 8" it accommodates larger hooks and longer leaders. The problem for many of us is storing long leaders with multiple hooks, well problem solved! The Jig and leader boards can handle just about anything with a hook including trebles! From pan fish to walleye, salmon, steelhead and numerous others species' this product isn't fancy or tricky it just flat works! and it stores easily. Leader board fits perfectly into the Plano 2-3715 box. 5132-0003: For big water to hold trolling flies and meat rigs and it needed to fit the Plano 2-3731. Measures a hefty 7 ¾" X 13 ½" with 17 slots to hold most anything you have.