These aerials have been re-engineered to have real springs around a new brass base unit, making them more accurate and stronger than the previous LW021 aerials (though these are still available while stocks last).
Any NATO vehicle using US radios mounted these aerials from the mid-1960s through to the 1990s and on.
As far as Leopards (1 and 2) are concerned, these aerials were used by Australia, Canada, Chile, Greece, Holland and Turkey.
The brass aerials are supplied with safety tips. Sometimes, these were not fitted in service, especially in the early days. Simply snip them off if not needed. Check your references.