Gianluca - greetings & welcome to TBN!
Very nice! They look like factory made - did you fabricate them?
My only suggestion is to maybe add a bushing on each of the lower pins to prevent the arms from sliding left or right.
This would give you more stable support of your implement.
If you locate the bushing between the Heim fitting and the lynch pin, it will also reduce bending load on the pins.
Ciao,
Jim