Hi Jon,

If what you have on the left is a Plug, Type F, 2-pin, Stores Ref. 5C/596, then you will want a Socket, Type F, 2-pin, Ref. 5C/597 to match it.

I think I have some out in the garage.

Yup that sounds like the one.

I foolishly thought that there would only be one size so happily bought the socket shown which has Stores Ref. 5C/599. Oh how wrong was I!?

Jon