How do i get air to my rear air shocks on my 91 buick park ave? on 1991 Buick Park Avenue

The rearend sags and occasionally drags the ground, Im pretty sure its a lack of air in the air shocks, but don't know how to air them up or if there are non air shocks that can be used

Asked by for the 1991 Buick Park Avenue
agree with goodguy
1 more answer
air ri you should be able to buy regular shocks from any parts store