New excellent reproduction Turn Lever / blinker arm with cruise button in the end as shown.
Has the flat splade with single bolt/ screw down to fasten... that is important. .its NOT the round post type.
The Cruise is activated with a depress button at the end on the lever.
Not cheap but specific and there are no GM ones commercially normally available and even then they were 2 or three times those repro now for no real gain.