Do you need the entire shock-and-spring assembly, or just the shock absorber? Our suspension is coil-overshock construction and not actually struts, so it can be rebuilt if it is just the shock that is worn out.
Just so you know, the on-line part lookup that a lot of independent shops use, has the wrong parts listed. They say that the Sky requires a particular (and very expensive) strut, instead of the (more reasonably priced) shocks we actually use.
I went to several different places and they all found the same (wrong) part. I ended up having to go to a GM dealer to get the correct ones installed, for far less than the "struts" would have cost from the others.