Can I use Rondo Close Up LensNo.2 on Rolleiflex Automat X?

Taking lens adapter I can mount, but viewing lens does not fit. Am I making somethig wrong?

That's a pre-war Rolleiflex with bayonet on the taking lens only. The camera can use the Proxars that has one with bayonet for the taking lens and one with 28,5 mm slip-on mount, or the 28,5 mm slip-on set. And on top of the viewing lens Proxar you could put the Rolleiparkeil parallax compensating accessory.

The close-up set you have there is for a camera with bayonets on both lenses. The thicker one is for the viewing lens. It has the parallax compensating glass wedge.

It takes these Proxars: https://www.ebay.de/itm/145093958664
And then this Rolleiparkeil/Rolleipar on top of the Proxar for the viewing lens: https://www.ebay.de/itm/154943310381

Your camera is the Rolleiflex Automat, typ 2, from 1938. The owner had the X sync added later.

Thanks JPD !