Which kickstart return spring?

[dickie]

I need a new return spring for my very late (1965) eibar series 2.

Presumably I need one for a series 2, but as it's so late maybe I need series 3?

Without knowing the difference between them I've no idea how to decide.

Anyone know?

[steve c]

series 2 are a smaller diameter, scootopia make them and they are about £5