Hello Matteo. Welcome to the Alfa BB.
I am very happy to hear from a RHD GTA owner.
The clutch lever you are looking for; is it the one that attaches to the under floor bracket and pin shown in your first picture?
If so you will most probably need to source it used in the UK. I am away from my documents but I am pretty sure that it is likely common to the RHD GT and probably RHD Spider and RHD Giulia.
Once I am home next month I may be able to help you find one.
In the mean time you can email me at
kendgb at aol dot com
Ken Geiger, Toronto
1965 GTA, RHD, Stradale
ex- 1965 GTA, RHD, Corsa, Trans/Am 66-72
1964 Sprint GT, B-Sedan in 70's
1970 Giulia Super (CDN Spec)
1976 1600 GTj (Italian Spec)
1966 Harley Sprint (Aermacchi) 250
2000 Catalina 320, Hull #765 Northern Dream
2001 BMW Z3 3.0i