We had an 1986 1000cl and a cable lasted 2 years repeatedly..
wasnt bad to change.. but had a tortuous route .. thanks to RHD
I seem to recall all of my similar age Uno were all hydraulic.. obviously a better solution
So.. what is the Bigger Eye for..? ( can you swap the mating rod to make 'a pair'?)
There will be companies.. like Venhill.. who can build you a cable.. but of course that has a price.
Shop4parts use the Italian aftermarket.. so are the obvious 1st port of call for OLD standard parts...
As you say..its the RHD element that the problem
No Lancia.. or similar crossover with that Part Number ? (I know Davren is good on that...)
Do let us know how it goes