Needed new ones each side. A great guy in Greece, Thanassis Gritsopoulus, who has alfa-restoration.co.uk, found us new right–hand side ones, but no left. He said the cable was long enough to be fitted to the left–hand side — and it was!
How Alfa came to have a one–sided surplus for a part fitted in pairs must date back to a mismatched order from their suppliers in the past. Good thing is, it doesn't matter … until they run out of stock of course.