Vic, according the 69 Firebird Assembly manual, the 1969 Y96 Firm Ride and Handling option used:
Front - 9789636
Rear - 3192923
...but the 1972 Pontiac Parts Index manual shows:
Front - 5353144
Rear - 3182147
I'm assuming the original 1969 part numbers were superceded by 1972.
By the way, the 67-69 Firebirds were also available with adjustable Koni shocks
. Very rare option, but I have seen a few PHS invoices with the Koni shock option on Sprint 6 cars, Firebird 400's, and 69 Trans Am's.