HI David, call scale models in skelmerdale, you can collect, he has a little unit like an Aladins cave 😀 but only opens a couple of times a week. I gave him an original Mersey Marine one and he copied it quite well in white metal, so I got a few off him, very cheap. They need a bit of tidying up and when painted look fine. The rail was just alloy rod

Try Red bank models website
(http://quantrum.co.uk/redbankmodels/bmodel-boat-fittings-hand-rails-c-61_68_146.html)

or deans marine chandlery. both do rb fittings which do some nice ball stantions in several diameters

Greg