Here is a link that may help. The Recumbent Bicycle and Human Powered Vehicle Information Center
I don't know what your application is, but for British race cars, many of them use SifBronze #2, or 101. You can source this from the UK. Just Google Sifbronze and you should be able to find the rod in various sizes. The Ariel Atom built in the UK still uses bronze welding. There are a few videos on YouTube of one of their artisans using the process...Brian Ashcroft.
I think he uses the SifBronze 101.