What you may want to do is purchase 5/8 inch bttens in bulk or long pieces and cut to length with hack saw yourself. If you do, round all the endges on both ends. You should inquire about this at the website store first and if not, there are other sources. As a dealer, I use to buy stock batten lengths in 12 feet but coiled up you had to be very carefull when releasing the coil or whap in the face which occurred one time with me. I was careful after that.
crazy dave