Sloans of Inverurie stock quite a few of the older rings which should match your rod.
Whipping rings is easy enough, matching the thread colour can be a problem sometimes. For example, Daiwa use an exclusive purple on there older Whisker rods which was impossible to match.
If you want to "upgrade" your rings, a fill set of snakes and a stripping guide would be on the right side of £15. Infact, I have full set at home still in the packaging (Seymo) you can have for a fiver