Change the support joints when changing the handlebars?

I was at the TÜV today and it challenged the crossbars, the front jack is knocked out. I want to change the crossbars myself, which you get from approx. 105 EUR (lem conveyor). Should the support joints be changed with the same thing? I now have 370 TKM down, but don’t know if and when something has been changed on the suspension. Are there any new screws and nuts on the crossbars? Lt. Vida should be used with new ones. Edit: I wanted to take the parts of Lemförder They’re supposed to be good?