Wanted: Clarks coloured teflon coated Rear Mech cable in red

[Hillwalker]

Title says it all really. I've changed the rear derailleur on my 1980ish Denton and now need a longer rear cable than I previously used. I have a pair of Clarks (teflon?) coated cables in this sort of orange/red colour and would be grateful if I could source a replacement.

Happy to buy or trade

HW