Does anyone know the part number for the Antenna Connector on the original cable harness (head unit Stream MP3) ? I am searching for a connector, which can be retrofitted and fits the original antenna cable AND the Stream MP3 head unit.

If your'e after the connector that connects to the head unit, then your out of luck, Skoda don't sell it individually you have to buy the complete harness from the roof antenna to the head unit. What I did when i broke mine, was to buy a Facra ( I think that is what it's called) to a normal aerial plug conversion lead and a seperate aeriel socket. You strip the aerial lead and fit the socket then connect the adaptor lead into the head unit first and then plug the aeriel plug and socket together.

Halfords sell the adaptor lead and Maplin sell aerial sockets.

Well, I also realized that Skoda only sell the complete cable harness - Part number 1z1035550C - and not a new antenna connector to be retrofitted... Thank you for your advice - I intend to go your way, and make a workaround. I have looked at Halfords and Maplin - and I see what you mean. Thanks a lot!