Late 90's into 2000's ZX are all composite look for the aluminum transom that the motor mounting plate (jack plate bolts to) it is easily visible.
On the SX the transom is structural foam (i could be wrong) which is why no jack plate is allowed on them. Skeeter discovered this when they went to all composite in mid late 90's. The fiberglass and gel was cracking by the extra leverege applied by jack plates and the foam was becoming water logged not good. No jack plate no problems with the SX.
My older ZX has a plywood transom I have had no problems with a jackplate on it.
Who ever said nothing in life is impossible.
Never tried slamming a revolving door.