On factory made hot rod cabriolet tops there are two "locking rods" between the two rear bowes. Each rod is linked on the middle, making it possible to fold it in two equal halves. To lock it in full length, there are a short piece of pipe, that is slided over the link preventing it from folding. What are these rods called in english? Are they availiable form other sources, like on Ebay, boat stores or others?