If you don't have a local Nacra dealer you can get the beam from an Aluminium supplier, you could contact Brisbane Catamaran Centre in Qld Aus for the dimensions, while your at it have a look inside the beam where the straps go and see if it has the I beam supports there, if not you can order those from Bris Cats while your at it, they do make a fair bit of difference regarding stiffness of the platform. Good luck with it and remember the Australian Nacra National championships are on this New Years coming up, with a week of sunshine on a big lake at my home club Meningie in South Aus, come and join the fun with around 20 other 5.8's, we already have one team coming from Hong Kong