I can't answer that; I don't have a bird and it was a pile of parts when I got it as you see here.
I was going to try to fit it to my Grand Prix but I ended up adapting a small platform hitch, which turned out to be pretty easy due to the architecture under the back of the car.
It also allows me to use the ball mount to get the height that I want.
K
__________________
'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.85 @ 136 mph best
http://www.superchevy.com/features/s...hevy-chevelle/
My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524
"Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926