You said the car also failed because of a worn drop-link. Even the slightest play in a drop-link will amplify when you drive and cause a very noticable suspension knock.

Also it would be a very good idea to have the wheel alignment (track) checked and if necessary adjusted now that you have changed the track rod ends.....

You did replace both drop links, didn't you? If one is worn, the other is too...

but I can now hear a knocking occasionaly when driving or going over a bump.

That's a droplink all right. Work out which side it is and swap that one (or just do both). Simple job and they don't cost much.

If it's knocking, it'll probably fall apart when you take it off. Mine did.