My 304 stainless steel roller arrived today and I can say that I'm more than pleased with the outcome.
I took a stab in the dark with the measurements described online and what do you know exact size and only set me back $29.00+ free shipping (600mm long).
The best part was I custom made it myself and didn't have to buy a reproduction online for $150.00 that takes away the original vintage look, I might order some new end caps but for now I will use the old ones until I pay for all the expensive stuff ahead of me.
I also took the handlebars down yesterday for re-chroming so they should be back in about a week's time, starting to look shiny now.