fork tubes for 1981rh/special

[jimg1au]

hi i have rust marks on my fork tubes and would like to replace them.the 1981rh in australia is a one off as most std parts dont fit.is there any other bike that has the same tubes maybe xj750 or xj650.any help would be great.the hard chromers what $300.00aus to rechrome them.
thanks
jim garvey
2x xs1.1rh