Vintage Minor Register

Has anyone got a spare, or know where to get, the little fuse box on top of sv dynamos?

I have just gone out and had a look at mine. I do not have a spare but noticed that the spare 'lid' I discribed elsewhere, Type A27, is from a dynamo but a lettle larger than a minor. At least I know where it comes from. 70mx40mx40m high. Highlander.