En france le Solex 4500 s'appelle 5000 et on trouve facilement des pièces..
In France is called the Solex 4500 and 5000 are readily available parts.
http://www.solex-motobecane.com/
http://www.lesolex.com/
http://cafesolex.com/boutique/index.php?id_lang=5