Aerial Puegnot 206?

I have a Puegnot 206 2004 with front fitted aerial but unfortunately when replacing base unit I undone all fittings without remembering sequence to refit. Besides aerial connection and retaining nut I have two other circular fittings - one has several integral electrical components and the other is black plastic ring with a small stub. Can't seem to work out in which way round or sequence they go back.