I went to Arnott Industries online (can't remember the URL) however, I was very displeased. Try Strutmasters.com and put in your make and model. I should have went with those. At Arnott, I paid about 750 for all 4 coil over strut/conventionals. I had my mechanic put them in for about 3 hours labor. He only charged 300, should have been 450. I was very unhappy with the ones I bought from Arnott as I thought my mechanic put the rears on the fronts and visa versa, however, he followed manufactures recommendations. I had to use clamps in the front to pull the car down and lifters in between the coils for the back to bring the back end up....I was so unhappy. There went my baby...
I do think it is the actuator(s)...better to have it diagnosed as I believe an actuator is quite less expensive than an air strut.
Let me know how things go....
Ciao!