Your local cabinet shop
It sounds like you may already have your answer, but I have some other advice that may be helpful. I just purchased teak through a local kitchen cabinet shop at a fraction of the cost of marine centers. The cabinet shop special ordered exactly what I needed and had it within a day. There was no shipping charge because he gets specialty wood shipments regularly. Of course, you must have a cabinet shop that is willing to help with your special need. Thanks, Jerry Smith